main.c revision 2448798133d747ad339e57099e32a1d1e68aca1c
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 "driver-ops.h"
30#include "rate.h"
31#include "mesh.h"
32#include "wep.h"
33#include "wme.h"
34#include "aes_ccm.h"
35#include "led.h"
36#include "cfg.h"
37#include "debugfs.h"
38#include "debugfs_netdev.h"
39
40/*
41 * For seeing transmitted packets on monitor interfaces
42 * we have a radiotap header too.
43 */
44struct ieee80211_tx_status_rtap_hdr {
45	struct ieee80211_radiotap_header hdr;
46	u8 rate;
47	u8 padding_for_rate;
48	__le16 tx_flags;
49	u8 data_retries;
50} __attribute__ ((packed));
51
52
53/* must be called under mdev tx lock */
54void ieee80211_configure_filter(struct ieee80211_local *local)
55{
56	unsigned int changed_flags;
57	unsigned int new_flags = 0;
58
59	if (atomic_read(&local->iff_promiscs))
60		new_flags |= FIF_PROMISC_IN_BSS;
61
62	if (atomic_read(&local->iff_allmultis))
63		new_flags |= FIF_ALLMULTI;
64
65	if (local->monitors)
66		new_flags |= FIF_BCN_PRBRESP_PROMISC;
67
68	if (local->fif_fcsfail)
69		new_flags |= FIF_FCSFAIL;
70
71	if (local->fif_plcpfail)
72		new_flags |= FIF_PLCPFAIL;
73
74	if (local->fif_control)
75		new_flags |= FIF_CONTROL;
76
77	if (local->fif_other_bss)
78		new_flags |= FIF_OTHER_BSS;
79
80	changed_flags = local->filter_flags ^ new_flags;
81
82	/* be a bit nasty */
83	new_flags |= (1<<31);
84
85	drv_configure_filter(local, 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
155int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
156{
157	struct ieee80211_channel *chan;
158	int ret = 0;
159	int power;
160	enum nl80211_channel_type channel_type;
161
162	might_sleep();
163
164	if (local->sw_scanning) {
165		chan = local->scan_channel;
166		channel_type = NL80211_CHAN_NO_HT;
167	} else {
168		chan = local->oper_channel;
169		channel_type = local->oper_channel_type;
170	}
171
172	if (chan != local->hw.conf.channel ||
173	    channel_type != local->hw.conf.channel_type) {
174		local->hw.conf.channel = chan;
175		local->hw.conf.channel_type = channel_type;
176		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
177	}
178
179	if (local->sw_scanning)
180		power = chan->max_power;
181	else
182		power = local->power_constr_level ?
183			(chan->max_power - local->power_constr_level) :
184			chan->max_power;
185
186	if (local->user_power_level >= 0)
187		power = min(power, local->user_power_level);
188
189	if (local->hw.conf.power_level != power) {
190		changed |= IEEE80211_CONF_CHANGE_POWER;
191		local->hw.conf.power_level = power;
192	}
193
194	if (changed && local->open_count) {
195		ret = drv_config(local, changed);
196		/*
197		 * Goal:
198		 * HW reconfiguration should never fail, the driver has told
199		 * us what it can support so it should live up to that promise.
200		 *
201		 * Current status:
202		 * rfkill is not integrated with mac80211 and a
203		 * configuration command can thus fail if hardware rfkill
204		 * is enabled
205		 *
206		 * FIXME: integrate rfkill with mac80211 and then add this
207		 * WARN_ON() back
208		 *
209		 */
210		/* WARN_ON(ret); */
211	}
212
213	return ret;
214}
215
216void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
217				      u32 changed)
218{
219	struct ieee80211_local *local = sdata->local;
220
221	if (!changed)
222		return;
223
224	if (sdata->vif.type == NL80211_IFTYPE_STATION)
225		sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
226	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
227		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
228	else if (sdata->vif.type == NL80211_IFTYPE_AP)
229		sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
230	else if (ieee80211_vif_is_mesh(&sdata->vif)) {
231		static const u8 zero[ETH_ALEN] = { 0 };
232		sdata->vif.bss_conf.bssid = zero;
233	} else {
234		WARN_ON(1);
235		return;
236	}
237
238	switch (sdata->vif.type) {
239	case NL80211_IFTYPE_AP:
240	case NL80211_IFTYPE_ADHOC:
241	case NL80211_IFTYPE_MESH_POINT:
242		break;
243	default:
244		/* do not warn to simplify caller in scan.c */
245		changed &= ~BSS_CHANGED_BEACON_ENABLED;
246		if (WARN_ON(changed & BSS_CHANGED_BEACON))
247			return;
248		break;
249	}
250
251	if (changed & BSS_CHANGED_BEACON_ENABLED) {
252		if (local->sw_scanning) {
253			sdata->vif.bss_conf.enable_beacon = false;
254		} else {
255			/*
256			 * Beacon should be enabled, but AP mode must
257			 * check whether there is a beacon configured.
258			 */
259			switch (sdata->vif.type) {
260			case NL80211_IFTYPE_AP:
261				sdata->vif.bss_conf.enable_beacon =
262					!!rcu_dereference(sdata->u.ap.beacon);
263				break;
264			case NL80211_IFTYPE_ADHOC:
265				sdata->vif.bss_conf.enable_beacon =
266					!!rcu_dereference(sdata->u.ibss.presp);
267				break;
268			case NL80211_IFTYPE_MESH_POINT:
269				sdata->vif.bss_conf.enable_beacon = true;
270				break;
271			default:
272				/* not reached */
273				WARN_ON(1);
274				break;
275			}
276		}
277	}
278
279	drv_bss_info_changed(local, &sdata->vif,
280			     &sdata->vif.bss_conf, changed);
281
282	/*
283	 * DEPRECATED
284	 *
285	 * ~changed is just there to not do this at resume time
286	 */
287	if (changed & BSS_CHANGED_BEACON_INT && ~changed) {
288		local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
289		ieee80211_hw_config(local,
290				    _IEEE80211_CONF_CHANGE_BEACON_INTERVAL);
291	}
292}
293
294u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
295{
296	sdata->vif.bss_conf.use_cts_prot = false;
297	sdata->vif.bss_conf.use_short_preamble = false;
298	sdata->vif.bss_conf.use_short_slot = false;
299	return BSS_CHANGED_ERP_CTS_PROT |
300	       BSS_CHANGED_ERP_PREAMBLE |
301	       BSS_CHANGED_ERP_SLOT;
302}
303
304void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
305				 struct sk_buff *skb)
306{
307	struct ieee80211_local *local = hw_to_local(hw);
308	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
309	int tmp;
310
311	skb->dev = local->mdev;
312	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
313	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
314		       &local->skb_queue : &local->skb_queue_unreliable, skb);
315	tmp = skb_queue_len(&local->skb_queue) +
316		skb_queue_len(&local->skb_queue_unreliable);
317	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
318	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
319		dev_kfree_skb_irq(skb);
320		tmp--;
321		I802_DEBUG_INC(local->tx_status_drop);
322	}
323	tasklet_schedule(&local->tasklet);
324}
325EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
326
327static void ieee80211_tasklet_handler(unsigned long data)
328{
329	struct ieee80211_local *local = (struct ieee80211_local *) data;
330	struct sk_buff *skb;
331	struct ieee80211_rx_status rx_status;
332	struct ieee80211_ra_tid *ra_tid;
333
334	while ((skb = skb_dequeue(&local->skb_queue)) ||
335	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
336		switch (skb->pkt_type) {
337		case IEEE80211_RX_MSG:
338			/* status is in skb->cb */
339			memcpy(&rx_status, skb->cb, sizeof(rx_status));
340			/* Clear skb->pkt_type in order to not confuse kernel
341			 * netstack. */
342			skb->pkt_type = 0;
343			__ieee80211_rx(local_to_hw(local), skb, &rx_status);
344			break;
345		case IEEE80211_TX_STATUS_MSG:
346			skb->pkt_type = 0;
347			ieee80211_tx_status(local_to_hw(local), skb);
348			break;
349		case IEEE80211_DELBA_MSG:
350			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
351			ieee80211_stop_tx_ba_cb(local_to_hw(local),
352						ra_tid->ra, ra_tid->tid);
353			dev_kfree_skb(skb);
354			break;
355		case IEEE80211_ADDBA_MSG:
356			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
357			ieee80211_start_tx_ba_cb(local_to_hw(local),
358						 ra_tid->ra, ra_tid->tid);
359			dev_kfree_skb(skb);
360			break ;
361		default:
362			WARN(1, "mac80211: Packet is of unknown type %d\n",
363			     skb->pkt_type);
364			dev_kfree_skb(skb);
365			break;
366		}
367	}
368}
369
370/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
371 * make a prepared TX frame (one that has been given to hw) to look like brand
372 * new IEEE 802.11 frame that is ready to go through TX processing again.
373 */
374static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
375				      struct ieee80211_key *key,
376				      struct sk_buff *skb)
377{
378	unsigned int hdrlen, iv_len, mic_len;
379	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
380
381	hdrlen = ieee80211_hdrlen(hdr->frame_control);
382
383	if (!key)
384		goto no_key;
385
386	switch (key->conf.alg) {
387	case ALG_WEP:
388		iv_len = WEP_IV_LEN;
389		mic_len = WEP_ICV_LEN;
390		break;
391	case ALG_TKIP:
392		iv_len = TKIP_IV_LEN;
393		mic_len = TKIP_ICV_LEN;
394		break;
395	case ALG_CCMP:
396		iv_len = CCMP_HDR_LEN;
397		mic_len = CCMP_MIC_LEN;
398		break;
399	default:
400		goto no_key;
401	}
402
403	if (skb->len >= hdrlen + mic_len &&
404	    !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
405		skb_trim(skb, skb->len - mic_len);
406	if (skb->len >= hdrlen + iv_len) {
407		memmove(skb->data + iv_len, skb->data, hdrlen);
408		hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
409	}
410
411no_key:
412	if (ieee80211_is_data_qos(hdr->frame_control)) {
413		hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
414		memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
415			hdrlen - IEEE80211_QOS_CTL_LEN);
416		skb_pull(skb, IEEE80211_QOS_CTL_LEN);
417	}
418}
419
420static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
421					    struct sta_info *sta,
422					    struct sk_buff *skb)
423{
424	sta->tx_filtered_count++;
425
426	/*
427	 * Clear the TX filter mask for this STA when sending the next
428	 * packet. If the STA went to power save mode, this will happen
429	 * when it wakes up for the next time.
430	 */
431	set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
432
433	/*
434	 * This code races in the following way:
435	 *
436	 *  (1) STA sends frame indicating it will go to sleep and does so
437	 *  (2) hardware/firmware adds STA to filter list, passes frame up
438	 *  (3) hardware/firmware processes TX fifo and suppresses a frame
439	 *  (4) we get TX status before having processed the frame and
440	 *	knowing that the STA has gone to sleep.
441	 *
442	 * This is actually quite unlikely even when both those events are
443	 * processed from interrupts coming in quickly after one another or
444	 * even at the same time because we queue both TX status events and
445	 * RX frames to be processed by a tasklet and process them in the
446	 * same order that they were received or TX status last. Hence, there
447	 * is no race as long as the frame RX is processed before the next TX
448	 * status, which drivers can ensure, see below.
449	 *
450	 * Note that this can only happen if the hardware or firmware can
451	 * actually add STAs to the filter list, if this is done by the
452	 * driver in response to set_tim() (which will only reduce the race
453	 * this whole filtering tries to solve, not completely solve it)
454	 * this situation cannot happen.
455	 *
456	 * To completely solve this race drivers need to make sure that they
457	 *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
458	 *	functions and
459	 *  (b) always process RX events before TX status events if ordering
460	 *      can be unknown, for example with different interrupt status
461	 *	bits.
462	 */
463	if (test_sta_flags(sta, WLAN_STA_PS) &&
464	    skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
465		ieee80211_remove_tx_extra(local, sta->key, skb);
466		skb_queue_tail(&sta->tx_filtered, skb);
467		return;
468	}
469
470	if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
471		/* Software retry the packet once */
472		skb->requeue = 1;
473		ieee80211_remove_tx_extra(local, sta->key, skb);
474		dev_queue_xmit(skb);
475		return;
476	}
477
478#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
479	if (net_ratelimit())
480		printk(KERN_DEBUG "%s: dropped TX filtered frame, "
481		       "queue_len=%d PS=%d @%lu\n",
482		       wiphy_name(local->hw.wiphy),
483		       skb_queue_len(&sta->tx_filtered),
484		       !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
485#endif
486	dev_kfree_skb(skb);
487}
488
489void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
490{
491	struct sk_buff *skb2;
492	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
493	struct ieee80211_local *local = hw_to_local(hw);
494	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
495	u16 frag, type;
496	__le16 fc;
497	struct ieee80211_supported_band *sband;
498	struct ieee80211_tx_status_rtap_hdr *rthdr;
499	struct ieee80211_sub_if_data *sdata;
500	struct net_device *prev_dev = NULL;
501	struct sta_info *sta;
502	int retry_count = -1, i;
503
504	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
505		/* the HW cannot have attempted that rate */
506		if (i >= hw->max_rates) {
507			info->status.rates[i].idx = -1;
508			info->status.rates[i].count = 0;
509		}
510
511		retry_count += info->status.rates[i].count;
512	}
513	if (retry_count < 0)
514		retry_count = 0;
515
516	rcu_read_lock();
517
518	sband = local->hw.wiphy->bands[info->band];
519
520	sta = sta_info_get(local, hdr->addr1);
521
522	if (sta) {
523		if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
524		    test_sta_flags(sta, WLAN_STA_PS)) {
525			/*
526			 * The STA is in power save mode, so assume
527			 * that this TX packet failed because of that.
528			 */
529			ieee80211_handle_filtered_frame(local, sta, skb);
530			rcu_read_unlock();
531			return;
532		}
533
534		fc = hdr->frame_control;
535
536		if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
537		    (ieee80211_is_data_qos(fc))) {
538			u16 tid, ssn;
539			u8 *qc;
540
541			qc = ieee80211_get_qos_ctl(hdr);
542			tid = qc[0] & 0xf;
543			ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
544						& IEEE80211_SCTL_SEQ);
545			ieee80211_send_bar(sta->sdata, hdr->addr1,
546					   tid, ssn);
547		}
548
549		if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
550			ieee80211_handle_filtered_frame(local, sta, skb);
551			rcu_read_unlock();
552			return;
553		} else {
554			if (!(info->flags & IEEE80211_TX_STAT_ACK))
555				sta->tx_retry_failed++;
556			sta->tx_retry_count += retry_count;
557		}
558
559		rate_control_tx_status(local, sband, sta, skb);
560	}
561
562	rcu_read_unlock();
563
564	ieee80211_led_tx(local, 0);
565
566	/* SNMP counters
567	 * Fragments are passed to low-level drivers as separate skbs, so these
568	 * are actually fragments, not frames. Update frame counters only for
569	 * the first fragment of the frame. */
570
571	frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
572	type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
573
574	if (info->flags & IEEE80211_TX_STAT_ACK) {
575		if (frag == 0) {
576			local->dot11TransmittedFrameCount++;
577			if (is_multicast_ether_addr(hdr->addr1))
578				local->dot11MulticastTransmittedFrameCount++;
579			if (retry_count > 0)
580				local->dot11RetryCount++;
581			if (retry_count > 1)
582				local->dot11MultipleRetryCount++;
583		}
584
585		/* This counter shall be incremented for an acknowledged MPDU
586		 * with an individual address in the address 1 field or an MPDU
587		 * with a multicast address in the address 1 field of type Data
588		 * or Management. */
589		if (!is_multicast_ether_addr(hdr->addr1) ||
590		    type == IEEE80211_FTYPE_DATA ||
591		    type == IEEE80211_FTYPE_MGMT)
592			local->dot11TransmittedFragmentCount++;
593	} else {
594		if (frag == 0)
595			local->dot11FailedCount++;
596	}
597
598	/* this was a transmitted frame, but now we want to reuse it */
599	skb_orphan(skb);
600
601	/*
602	 * This is a bit racy but we can avoid a lot of work
603	 * with this test...
604	 */
605	if (!local->monitors && !local->cooked_mntrs) {
606		dev_kfree_skb(skb);
607		return;
608	}
609
610	/* send frame to monitor interfaces now */
611
612	if (skb_headroom(skb) < sizeof(*rthdr)) {
613		printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
614		dev_kfree_skb(skb);
615		return;
616	}
617
618	rthdr = (struct ieee80211_tx_status_rtap_hdr *)
619				skb_push(skb, sizeof(*rthdr));
620
621	memset(rthdr, 0, sizeof(*rthdr));
622	rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
623	rthdr->hdr.it_present =
624		cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
625			    (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
626			    (1 << IEEE80211_RADIOTAP_RATE));
627
628	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
629	    !is_multicast_ether_addr(hdr->addr1))
630		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
631
632	/*
633	 * XXX: Once radiotap gets the bitmap reset thing the vendor
634	 *	extensions proposal contains, we can actually report
635	 *	the whole set of tries we did.
636	 */
637	if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
638	    (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
639		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
640	else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
641		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
642	if (info->status.rates[0].idx >= 0 &&
643	    !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
644		rthdr->rate = sband->bitrates[
645				info->status.rates[0].idx].bitrate / 5;
646
647	/* for now report the total retry_count */
648	rthdr->data_retries = retry_count;
649
650	/* XXX: is this sufficient for BPF? */
651	skb_set_mac_header(skb, 0);
652	skb->ip_summed = CHECKSUM_UNNECESSARY;
653	skb->pkt_type = PACKET_OTHERHOST;
654	skb->protocol = htons(ETH_P_802_2);
655	memset(skb->cb, 0, sizeof(skb->cb));
656
657	rcu_read_lock();
658	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
659		if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
660			if (!netif_running(sdata->dev))
661				continue;
662
663			if (prev_dev) {
664				skb2 = skb_clone(skb, GFP_ATOMIC);
665				if (skb2) {
666					skb2->dev = prev_dev;
667					netif_rx(skb2);
668				}
669			}
670
671			prev_dev = sdata->dev;
672		}
673	}
674	if (prev_dev) {
675		skb->dev = prev_dev;
676		netif_rx(skb);
677		skb = NULL;
678	}
679	rcu_read_unlock();
680	dev_kfree_skb(skb);
681}
682EXPORT_SYMBOL(ieee80211_tx_status);
683
684static void ieee80211_restart_work(struct work_struct *work)
685{
686	struct ieee80211_local *local =
687		container_of(work, struct ieee80211_local, restart_work);
688
689	rtnl_lock();
690	ieee80211_reconfig(local);
691	rtnl_unlock();
692}
693
694void ieee80211_restart_hw(struct ieee80211_hw *hw)
695{
696	struct ieee80211_local *local = hw_to_local(hw);
697
698	/* use this reason, __ieee80211_resume will unblock it */
699	ieee80211_stop_queues_by_reason(hw,
700		IEEE80211_QUEUE_STOP_REASON_SUSPEND);
701
702	schedule_work(&local->restart_work);
703}
704EXPORT_SYMBOL(ieee80211_restart_hw);
705
706struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
707					const struct ieee80211_ops *ops)
708{
709	struct ieee80211_local *local;
710	int priv_size, i;
711	struct wiphy *wiphy;
712
713	/* Ensure 32-byte alignment of our private data and hw private data.
714	 * We use the wiphy priv data for both our ieee80211_local and for
715	 * the driver's private data
716	 *
717	 * In memory it'll be like this:
718	 *
719	 * +-------------------------+
720	 * | struct wiphy	    |
721	 * +-------------------------+
722	 * | struct ieee80211_local  |
723	 * +-------------------------+
724	 * | driver's private data   |
725	 * +-------------------------+
726	 *
727	 */
728	priv_size = ((sizeof(struct ieee80211_local) +
729		      NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
730		    priv_data_len;
731
732	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
733
734	if (!wiphy)
735		return NULL;
736
737	wiphy->privid = mac80211_wiphy_privid;
738
739	/* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
740	wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
741			       sizeof(struct cfg80211_bss);
742
743	local = wiphy_priv(wiphy);
744
745	local->hw.wiphy = wiphy;
746
747	local->hw.priv = (char *)local +
748			 ((sizeof(struct ieee80211_local) +
749			   NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
750
751	BUG_ON(!ops->tx);
752	BUG_ON(!ops->start);
753	BUG_ON(!ops->stop);
754	BUG_ON(!ops->config);
755	BUG_ON(!ops->add_interface);
756	BUG_ON(!ops->remove_interface);
757	BUG_ON(!ops->configure_filter);
758	local->ops = ops;
759
760	/* set up some defaults */
761	local->hw.queues = 1;
762	local->hw.max_rates = 1;
763	local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
764	local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
765	local->hw.conf.radio_enabled = true;
766	local->user_power_level = -1;
767
768	INIT_LIST_HEAD(&local->interfaces);
769	mutex_init(&local->iflist_mtx);
770	mutex_init(&local->scan_mtx);
771
772	spin_lock_init(&local->key_lock);
773
774	spin_lock_init(&local->queue_stop_reason_lock);
775
776	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
777
778	INIT_WORK(&local->restart_work, ieee80211_restart_work);
779
780	INIT_WORK(&local->dynamic_ps_enable_work,
781		  ieee80211_dynamic_ps_enable_work);
782	INIT_WORK(&local->dynamic_ps_disable_work,
783		  ieee80211_dynamic_ps_disable_work);
784	setup_timer(&local->dynamic_ps_timer,
785		    ieee80211_dynamic_ps_timer, (unsigned long) local);
786
787	sta_info_init(local);
788
789	for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
790		skb_queue_head_init(&local->pending[i]);
791	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
792		     (unsigned long)local);
793	tasklet_disable(&local->tx_pending_tasklet);
794
795	tasklet_init(&local->tasklet,
796		     ieee80211_tasklet_handler,
797		     (unsigned long) local);
798	tasklet_disable(&local->tasklet);
799
800	skb_queue_head_init(&local->skb_queue);
801	skb_queue_head_init(&local->skb_queue_unreliable);
802
803	spin_lock_init(&local->ampdu_lock);
804
805	return local_to_hw(local);
806}
807EXPORT_SYMBOL(ieee80211_alloc_hw);
808
809static const struct net_device_ops ieee80211_master_ops = {
810	.ndo_start_xmit = ieee80211_master_start_xmit,
811	.ndo_open = ieee80211_master_open,
812	.ndo_stop = ieee80211_master_stop,
813	.ndo_set_multicast_list = ieee80211_master_set_multicast_list,
814	.ndo_select_queue = ieee80211_select_queue,
815};
816
817static void ieee80211_master_setup(struct net_device *mdev)
818{
819	mdev->type = ARPHRD_IEEE80211;
820	mdev->netdev_ops = &ieee80211_master_ops;
821	mdev->header_ops = &ieee80211_header_ops;
822	mdev->tx_queue_len = 1000;
823	mdev->addr_len = ETH_ALEN;
824}
825
826int ieee80211_register_hw(struct ieee80211_hw *hw)
827{
828	struct ieee80211_local *local = hw_to_local(hw);
829	int result;
830	enum ieee80211_band band;
831	struct net_device *mdev;
832	struct ieee80211_master_priv *mpriv;
833	int channels, i, j, max_bitrates;
834	bool supp_ht;
835	static const u32 cipher_suites[] = {
836		WLAN_CIPHER_SUITE_WEP40,
837		WLAN_CIPHER_SUITE_WEP104,
838		WLAN_CIPHER_SUITE_TKIP,
839		WLAN_CIPHER_SUITE_CCMP,
840
841		/* keep last -- depends on hw flags! */
842		WLAN_CIPHER_SUITE_AES_CMAC
843	};
844
845	/*
846	 * generic code guarantees at least one band,
847	 * set this very early because much code assumes
848	 * that hw.conf.channel is assigned
849	 */
850	channels = 0;
851	max_bitrates = 0;
852	supp_ht = false;
853	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
854		struct ieee80211_supported_band *sband;
855
856		sband = local->hw.wiphy->bands[band];
857		if (!sband)
858			continue;
859		if (!local->oper_channel) {
860			/* init channel we're on */
861			local->hw.conf.channel =
862			local->oper_channel =
863			local->scan_channel = &sband->channels[0];
864		}
865		channels += sband->n_channels;
866
867		if (max_bitrates < sband->n_bitrates)
868			max_bitrates = sband->n_bitrates;
869		supp_ht = supp_ht || sband->ht_cap.ht_supported;
870	}
871
872	local->int_scan_req.n_channels = channels;
873	local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
874	if (!local->int_scan_req.channels)
875		return -ENOMEM;
876
877	/* if low-level driver supports AP, we also support VLAN */
878	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
879		local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
880
881	/* mac80211 always supports monitor */
882	local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
883
884	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
885		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
886	else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
887		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
888
889	/*
890	 * Calculate scan IE length -- we need this to alloc
891	 * memory and to subtract from the driver limit. It
892	 * includes the (extended) supported rates and HT
893	 * information -- SSID is the driver's responsibility.
894	 */
895	local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
896	if (supp_ht)
897		local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
898
899	if (!local->ops->hw_scan) {
900		/* For hw_scan, driver needs to set these up. */
901		local->hw.wiphy->max_scan_ssids = 4;
902		local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
903	}
904
905	/*
906	 * If the driver supports any scan IEs, then assume the
907	 * limit includes the IEs mac80211 will add, otherwise
908	 * leave it at zero and let the driver sort it out; we
909	 * still pass our IEs to the driver but userspace will
910	 * not be allowed to in that case.
911	 */
912	if (local->hw.wiphy->max_scan_ie_len)
913		local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
914
915	local->hw.wiphy->cipher_suites = cipher_suites;
916	local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
917	if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
918		local->hw.wiphy->n_cipher_suites--;
919
920	result = wiphy_register(local->hw.wiphy);
921	if (result < 0)
922		goto fail_wiphy_register;
923
924	/*
925	 * We use the number of queues for feature tests (QoS, HT) internally
926	 * so restrict them appropriately.
927	 */
928	if (hw->queues > IEEE80211_MAX_QUEUES)
929		hw->queues = IEEE80211_MAX_QUEUES;
930
931	mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
932			       "wmaster%d", ieee80211_master_setup,
933			       hw->queues);
934	if (!mdev)
935		goto fail_mdev_alloc;
936
937	mpriv = netdev_priv(mdev);
938	mpriv->local = local;
939	local->mdev = mdev;
940
941	local->hw.workqueue =
942		create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
943	if (!local->hw.workqueue) {
944		result = -ENOMEM;
945		goto fail_workqueue;
946	}
947
948	/*
949	 * The hardware needs headroom for sending the frame,
950	 * and we need some headroom for passing the frame to monitor
951	 * interfaces, but never both at the same time.
952	 */
953	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
954				   sizeof(struct ieee80211_tx_status_rtap_hdr));
955
956	debugfs_hw_add(local);
957
958	if (local->hw.max_listen_interval == 0)
959		local->hw.max_listen_interval = 1;
960
961	local->hw.conf.listen_interval = local->hw.max_listen_interval;
962
963	result = sta_info_start(local);
964	if (result < 0)
965		goto fail_sta_info;
966
967	result = ieee80211_wep_init(local);
968	if (result < 0) {
969		printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
970		       wiphy_name(local->hw.wiphy), result);
971		goto fail_wep;
972	}
973
974	rtnl_lock();
975	result = dev_alloc_name(local->mdev, local->mdev->name);
976	if (result < 0)
977		goto fail_dev;
978
979	memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
980	SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
981	local->mdev->features |= NETIF_F_NETNS_LOCAL;
982
983	result = register_netdevice(local->mdev);
984	if (result < 0)
985		goto fail_dev;
986
987	result = ieee80211_init_rate_ctrl_alg(local,
988					      hw->rate_control_algorithm);
989	if (result < 0) {
990		printk(KERN_DEBUG "%s: Failed to initialize rate control "
991		       "algorithm\n", wiphy_name(local->hw.wiphy));
992		goto fail_rate;
993	}
994
995	/* add one default STA interface if supported */
996	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
997		result = ieee80211_if_add(local, "wlan%d", NULL,
998					  NL80211_IFTYPE_STATION, NULL);
999		if (result)
1000			printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1001			       wiphy_name(local->hw.wiphy));
1002	}
1003
1004	rtnl_unlock();
1005
1006	ieee80211_led_init(local);
1007
1008	/* alloc internal scan request */
1009	i = 0;
1010	local->int_scan_req.ssids = &local->scan_ssid;
1011	local->int_scan_req.n_ssids = 1;
1012	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1013		if (!hw->wiphy->bands[band])
1014			continue;
1015		for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
1016			local->int_scan_req.channels[i] =
1017				&hw->wiphy->bands[band]->channels[j];
1018			i++;
1019		}
1020	}
1021
1022	local->network_latency_notifier.notifier_call =
1023		ieee80211_max_network_latency;
1024	result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1025				     &local->network_latency_notifier);
1026
1027	if (result) {
1028		rtnl_lock();
1029		goto fail_pm_qos;
1030	}
1031
1032	return 0;
1033
1034 fail_pm_qos:
1035	ieee80211_led_exit(local);
1036	ieee80211_remove_interfaces(local);
1037 fail_rate:
1038	unregister_netdevice(local->mdev);
1039	local->mdev = NULL;
1040 fail_dev:
1041	rtnl_unlock();
1042	ieee80211_wep_free(local);
1043 fail_wep:
1044	sta_info_stop(local);
1045 fail_sta_info:
1046	debugfs_hw_del(local);
1047	destroy_workqueue(local->hw.workqueue);
1048 fail_workqueue:
1049	if (local->mdev)
1050		free_netdev(local->mdev);
1051 fail_mdev_alloc:
1052	wiphy_unregister(local->hw.wiphy);
1053 fail_wiphy_register:
1054	kfree(local->int_scan_req.channels);
1055	return result;
1056}
1057EXPORT_SYMBOL(ieee80211_register_hw);
1058
1059void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1060{
1061	struct ieee80211_local *local = hw_to_local(hw);
1062
1063	tasklet_kill(&local->tx_pending_tasklet);
1064	tasklet_kill(&local->tasklet);
1065
1066	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1067			       &local->network_latency_notifier);
1068
1069	rtnl_lock();
1070
1071	/*
1072	 * At this point, interface list manipulations are fine
1073	 * because the driver cannot be handing us frames any
1074	 * more and the tasklet is killed.
1075	 */
1076
1077	/* First, we remove all virtual interfaces. */
1078	ieee80211_remove_interfaces(local);
1079
1080	/* then, finally, remove the master interface */
1081	unregister_netdevice(local->mdev);
1082
1083	rtnl_unlock();
1084
1085	ieee80211_clear_tx_pending(local);
1086	sta_info_stop(local);
1087	rate_control_deinitialize(local);
1088	debugfs_hw_del(local);
1089
1090	if (skb_queue_len(&local->skb_queue)
1091			|| skb_queue_len(&local->skb_queue_unreliable))
1092		printk(KERN_WARNING "%s: skb_queue not empty\n",
1093		       wiphy_name(local->hw.wiphy));
1094	skb_queue_purge(&local->skb_queue);
1095	skb_queue_purge(&local->skb_queue_unreliable);
1096
1097	destroy_workqueue(local->hw.workqueue);
1098	wiphy_unregister(local->hw.wiphy);
1099	ieee80211_wep_free(local);
1100	ieee80211_led_exit(local);
1101	free_netdev(local->mdev);
1102	kfree(local->int_scan_req.channels);
1103}
1104EXPORT_SYMBOL(ieee80211_unregister_hw);
1105
1106void ieee80211_free_hw(struct ieee80211_hw *hw)
1107{
1108	struct ieee80211_local *local = hw_to_local(hw);
1109
1110	mutex_destroy(&local->iflist_mtx);
1111	mutex_destroy(&local->scan_mtx);
1112
1113	wiphy_free(local->hw.wiphy);
1114}
1115EXPORT_SYMBOL(ieee80211_free_hw);
1116
1117static int __init ieee80211_init(void)
1118{
1119	struct sk_buff *skb;
1120	int ret;
1121
1122	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1123	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1124		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1125
1126	ret = rc80211_minstrel_init();
1127	if (ret)
1128		return ret;
1129
1130	ret = rc80211_pid_init();
1131	if (ret)
1132		return ret;
1133
1134	ieee80211_debugfs_netdev_init();
1135
1136	return 0;
1137}
1138
1139static void __exit ieee80211_exit(void)
1140{
1141	rc80211_pid_exit();
1142	rc80211_minstrel_exit();
1143
1144	/*
1145	 * For key todo, it'll be empty by now but the work
1146	 * might still be scheduled.
1147	 */
1148	flush_scheduled_work();
1149
1150	if (mesh_allocated)
1151		ieee80211s_stop();
1152
1153	ieee80211_debugfs_netdev_exit();
1154}
1155
1156
1157subsys_initcall(ieee80211_init);
1158module_exit(ieee80211_exit);
1159
1160MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1161MODULE_LICENSE("GPL");
1162