main.c revision 7a725f73403e874ec52c58741e9b98cd604dbd03 
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	__le16 tx_flags;
45	u8 data_retries;
46} __attribute__ ((packed));
47
48
49/* must be called under mdev tx lock */
50void ieee80211_configure_filter(struct ieee80211_local *local)
51{
52	unsigned int changed_flags;
53	unsigned int new_flags = 0;
54
55	if (atomic_read(&local->iff_promiscs))
56		new_flags |= FIF_PROMISC_IN_BSS;
57
58	if (atomic_read(&local->iff_allmultis))
59		new_flags |= FIF_ALLMULTI;
60
61	if (local->monitors)
62		new_flags |= FIF_BCN_PRBRESP_PROMISC;
63
64	if (local->fif_fcsfail)
65		new_flags |= FIF_FCSFAIL;
66
67	if (local->fif_plcpfail)
68		new_flags |= FIF_PLCPFAIL;
69
70	if (local->fif_control)
71		new_flags |= FIF_CONTROL;
72
73	if (local->fif_other_bss)
74		new_flags |= FIF_OTHER_BSS;
75
76	changed_flags = local->filter_flags ^ new_flags;
77
78	/* be a bit nasty */
79	new_flags |= (1<<31);
80
81	local->ops->configure_filter(local_to_hw(local),
82				     changed_flags, &new_flags,
83				     local->mdev->mc_count,
84				     local->mdev->mc_list);
85
86	WARN_ON(new_flags & (1<<31));
87
88	local->filter_flags = new_flags & ~(1<<31);
89}
90
91/* master interface */
92
93static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
94{
95	memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
96	return ETH_ALEN;
97}
98
99static const struct header_ops ieee80211_header_ops = {
100	.create		= eth_header,
101	.parse		= header_parse_80211,
102	.rebuild	= eth_rebuild_header,
103	.cache		= eth_header_cache,
104	.cache_update	= eth_header_cache_update,
105};
106
107static int ieee80211_master_open(struct net_device *dev)
108{
109	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
110	struct ieee80211_sub_if_data *sdata;
111	int res = -EOPNOTSUPP;
112
113	/* we hold the RTNL here so can safely walk the list */
114	list_for_each_entry(sdata, &local->interfaces, list) {
115		if (netif_running(sdata->dev)) {
116			res = 0;
117			break;
118		}
119	}
120
121	if (res)
122		return res;
123
124	netif_tx_start_all_queues(local->mdev);
125
126	return 0;
127}
128
129static int ieee80211_master_stop(struct net_device *dev)
130{
131	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
132	struct ieee80211_sub_if_data *sdata;
133
134	/* we hold the RTNL here so can safely walk the list */
135	list_for_each_entry(sdata, &local->interfaces, list)
136		if (netif_running(sdata->dev))
137			dev_close(sdata->dev);
138
139	return 0;
140}
141
142static void ieee80211_master_set_multicast_list(struct net_device *dev)
143{
144	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
145
146	ieee80211_configure_filter(local);
147}
148
149/* everything else */
150
151int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
152{
153	struct ieee80211_local *local = sdata->local;
154	struct ieee80211_if_conf conf;
155
156	if (WARN_ON(!netif_running(sdata->dev)))
157		return 0;
158
159	if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
160		return -EINVAL;
161
162	if (!local->ops->config_interface)
163		return 0;
164
165	memset(&conf, 0, sizeof(conf));
166	conf.changed = changed;
167
168	if (sdata->vif.type == NL80211_IFTYPE_STATION ||
169	    sdata->vif.type == NL80211_IFTYPE_ADHOC) {
170		conf.bssid = sdata->u.sta.bssid;
171		conf.ssid = sdata->u.sta.ssid;
172		conf.ssid_len = sdata->u.sta.ssid_len;
173	} else if (sdata->vif.type == NL80211_IFTYPE_AP) {
174		conf.bssid = sdata->dev->dev_addr;
175		conf.ssid = sdata->u.ap.ssid;
176		conf.ssid_len = sdata->u.ap.ssid_len;
177	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
178		u8 zero[ETH_ALEN] = { 0 };
179		conf.bssid = zero;
180		conf.ssid = zero;
181		conf.ssid_len = 0;
182	} else {
183		WARN_ON(1);
184		return -EINVAL;
185	}
186
187	if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
188		return -EINVAL;
189
190	if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
191		return -EINVAL;
192
193	return local->ops->config_interface(local_to_hw(local),
194					    &sdata->vif, &conf);
195}
196
197int ieee80211_hw_config(struct ieee80211_local *local)
198{
199	struct ieee80211_channel *chan;
200	int ret = 0;
201
202	if (local->sw_scanning)
203		chan = local->scan_channel;
204	else
205		chan = local->oper_channel;
206
207	local->hw.conf.channel = chan;
208
209	if (!local->hw.conf.power_level)
210		local->hw.conf.power_level = chan->max_power;
211	else
212		local->hw.conf.power_level = min(chan->max_power,
213					       local->hw.conf.power_level);
214
215	local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
216
217#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
218	printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
219	       wiphy_name(local->hw.wiphy), chan->center_freq);
220#endif
221
222	if (local->open_count)
223		ret = local->ops->config(local_to_hw(local), &local->hw.conf);
224
225	return ret;
226}
227
228/**
229 * ieee80211_handle_ht should be used only after legacy configuration
230 * has been determined namely band, as ht configuration depends upon
231 * the hardware's HT abilities for a _specific_ band.
232 */
233u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
234			   struct ieee80211_ht_info *req_ht_cap,
235			   struct ieee80211_ht_bss_info *req_bss_cap)
236{
237	struct ieee80211_conf *conf = &local->hw.conf;
238	struct ieee80211_supported_band *sband;
239	struct ieee80211_ht_info ht_conf;
240	struct ieee80211_ht_bss_info ht_bss_conf;
241	u32 changed = 0;
242	int i;
243	u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
244	u8 tx_mcs_set_cap;
245
246	sband = local->hw.wiphy->bands[conf->channel->band];
247
248	memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
249	memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
250
251	/* HT is not supported */
252	if (!sband->ht_info.ht_supported) {
253		conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
254		goto out;
255	}
256
257	/* disable HT */
258	if (!enable_ht) {
259		if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
260			changed |= BSS_CHANGED_HT;
261		conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
262		conf->ht_conf.ht_supported = 0;
263		goto out;
264	}
265
266
267	if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
268		changed |= BSS_CHANGED_HT;
269
270	conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
271	ht_conf.ht_supported = 1;
272
273	ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
274	ht_conf.cap &= ~(IEEE80211_HT_CAP_SM_PS);
275	ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_SM_PS;
276	ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
277	ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
278	ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
279
280	ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
281	ht_conf.ampdu_density = req_ht_cap->ampdu_density;
282
283	/* Bits 96-100 */
284	tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
285
286	/* configure suppoerted Tx MCS according to requested MCS
287	 * (based in most cases on Rx capabilities of peer) and self
288	 * Tx MCS capabilities (as defined by low level driver HW
289	 * Tx capabilities) */
290	if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
291		goto check_changed;
292
293	/* Counting from 0 therfore + 1 */
294	if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
295		max_tx_streams = ((tx_mcs_set_cap &
296				IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
297
298	for (i = 0; i < max_tx_streams; i++)
299		ht_conf.supp_mcs_set[i] =
300			sband->ht_info.supp_mcs_set[i] &
301					req_ht_cap->supp_mcs_set[i];
302
303	if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
304		for (i = IEEE80211_SUPP_MCS_SET_UEQM;
305		     i < IEEE80211_SUPP_MCS_SET_LEN; i++)
306			ht_conf.supp_mcs_set[i] =
307				sband->ht_info.supp_mcs_set[i] &
308					req_ht_cap->supp_mcs_set[i];
309
310check_changed:
311	/* if bss configuration changed store the new one */
312	if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
313	    memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
314		changed |= BSS_CHANGED_HT;
315		memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
316		memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
317	}
318out:
319	return changed;
320}
321
322void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
323				      u32 changed)
324{
325	struct ieee80211_local *local = sdata->local;
326
327	if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
328		return;
329
330	if (!changed)
331		return;
332
333	if (local->ops->bss_info_changed)
334		local->ops->bss_info_changed(local_to_hw(local),
335					     &sdata->vif,
336					     &sdata->bss_conf,
337					     changed);
338}
339
340u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
341{
342	sdata->bss_conf.use_cts_prot = 0;
343	sdata->bss_conf.use_short_preamble = 0;
344	return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
345}
346
347void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
348				 struct sk_buff *skb)
349{
350	struct ieee80211_local *local = hw_to_local(hw);
351	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
352	int tmp;
353
354	skb->dev = local->mdev;
355	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
356	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
357		       &local->skb_queue : &local->skb_queue_unreliable, skb);
358	tmp = skb_queue_len(&local->skb_queue) +
359		skb_queue_len(&local->skb_queue_unreliable);
360	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
361	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
362		dev_kfree_skb_irq(skb);
363		tmp--;
364		I802_DEBUG_INC(local->tx_status_drop);
365	}
366	tasklet_schedule(&local->tasklet);
367}
368EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
369
370static void ieee80211_tasklet_handler(unsigned long data)
371{
372	struct ieee80211_local *local = (struct ieee80211_local *) data;
373	struct sk_buff *skb;
374	struct ieee80211_rx_status rx_status;
375	struct ieee80211_ra_tid *ra_tid;
376
377	while ((skb = skb_dequeue(&local->skb_queue)) ||
378	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
379		switch (skb->pkt_type) {
380		case IEEE80211_RX_MSG:
381			/* status is in skb->cb */
382			memcpy(&rx_status, skb->cb, sizeof(rx_status));
383			/* Clear skb->pkt_type in order to not confuse kernel
384			 * netstack. */
385			skb->pkt_type = 0;
386			__ieee80211_rx(local_to_hw(local), skb, &rx_status);
387			break;
388		case IEEE80211_TX_STATUS_MSG:
389			skb->pkt_type = 0;
390			ieee80211_tx_status(local_to_hw(local), skb);
391			break;
392		case IEEE80211_DELBA_MSG:
393			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
394			ieee80211_stop_tx_ba_cb(local_to_hw(local),
395						ra_tid->ra, ra_tid->tid);
396			dev_kfree_skb(skb);
397			break;
398		case IEEE80211_ADDBA_MSG:
399			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
400			ieee80211_start_tx_ba_cb(local_to_hw(local),
401						 ra_tid->ra, ra_tid->tid);
402			dev_kfree_skb(skb);
403			break ;
404		default:
405			WARN_ON(1);
406			dev_kfree_skb(skb);
407			break;
408		}
409	}
410}
411
412/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
413 * make a prepared TX frame (one that has been given to hw) to look like brand
414 * new IEEE 802.11 frame that is ready to go through TX processing again.
415 */
416static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
417				      struct ieee80211_key *key,
418				      struct sk_buff *skb)
419{
420	unsigned int hdrlen, iv_len, mic_len;
421	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
422
423	hdrlen = ieee80211_hdrlen(hdr->frame_control);
424
425	if (!key)
426		goto no_key;
427
428	switch (key->conf.alg) {
429	case ALG_WEP:
430		iv_len = WEP_IV_LEN;
431		mic_len = WEP_ICV_LEN;
432		break;
433	case ALG_TKIP:
434		iv_len = TKIP_IV_LEN;
435		mic_len = TKIP_ICV_LEN;
436		break;
437	case ALG_CCMP:
438		iv_len = CCMP_HDR_LEN;
439		mic_len = CCMP_MIC_LEN;
440		break;
441	default:
442		goto no_key;
443	}
444
445	if (skb->len >= hdrlen + mic_len &&
446	    !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
447		skb_trim(skb, skb->len - mic_len);
448	if (skb->len >= hdrlen + iv_len) {
449		memmove(skb->data + iv_len, skb->data, hdrlen);
450		hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
451	}
452
453no_key:
454	if (ieee80211_is_data_qos(hdr->frame_control)) {
455		hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
456		memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
457			hdrlen - IEEE80211_QOS_CTL_LEN);
458		skb_pull(skb, IEEE80211_QOS_CTL_LEN);
459	}
460}
461
462static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
463					    struct sta_info *sta,
464					    struct sk_buff *skb)
465{
466	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
467
468	sta->tx_filtered_count++;
469
470	/*
471	 * Clear the TX filter mask for this STA when sending the next
472	 * packet. If the STA went to power save mode, this will happen
473	 * when it wakes up for the next time.
474	 */
475	set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
476
477	/*
478	 * This code races in the following way:
479	 *
480	 *  (1) STA sends frame indicating it will go to sleep and does so
481	 *  (2) hardware/firmware adds STA to filter list, passes frame up
482	 *  (3) hardware/firmware processes TX fifo and suppresses a frame
483	 *  (4) we get TX status before having processed the frame and
484	 *	knowing that the STA has gone to sleep.
485	 *
486	 * This is actually quite unlikely even when both those events are
487	 * processed from interrupts coming in quickly after one another or
488	 * even at the same time because we queue both TX status events and
489	 * RX frames to be processed by a tasklet and process them in the
490	 * same order that they were received or TX status last. Hence, there
491	 * is no race as long as the frame RX is processed before the next TX
492	 * status, which drivers can ensure, see below.
493	 *
494	 * Note that this can only happen if the hardware or firmware can
495	 * actually add STAs to the filter list, if this is done by the
496	 * driver in response to set_tim() (which will only reduce the race
497	 * this whole filtering tries to solve, not completely solve it)
498	 * this situation cannot happen.
499	 *
500	 * To completely solve this race drivers need to make sure that they
501	 *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
502	 *	functions and
503	 *  (b) always process RX events before TX status events if ordering
504	 *      can be unknown, for example with different interrupt status
505	 *	bits.
506	 */
507	if (test_sta_flags(sta, WLAN_STA_PS) &&
508	    skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
509		ieee80211_remove_tx_extra(local, sta->key, skb);
510		skb_queue_tail(&sta->tx_filtered, skb);
511		return;
512	}
513
514	if (!test_sta_flags(sta, WLAN_STA_PS) &&
515	    !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
516		/* Software retry the packet once */
517		info->flags |= IEEE80211_TX_CTL_REQUEUE;
518		ieee80211_remove_tx_extra(local, sta->key, skb);
519		dev_queue_xmit(skb);
520		return;
521	}
522
523#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
524	if (net_ratelimit())
525		printk(KERN_DEBUG "%s: dropped TX filtered frame, "
526		       "queue_len=%d PS=%d @%lu\n",
527		       wiphy_name(local->hw.wiphy),
528		       skb_queue_len(&sta->tx_filtered),
529		       !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
530#endif
531	dev_kfree_skb(skb);
532}
533
534void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
535{
536	struct sk_buff *skb2;
537	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
538	struct ieee80211_local *local = hw_to_local(hw);
539	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
540	u16 frag, type;
541	__le16 fc;
542	struct ieee80211_tx_status_rtap_hdr *rthdr;
543	struct ieee80211_sub_if_data *sdata;
544	struct net_device *prev_dev = NULL;
545	struct sta_info *sta;
546
547	rcu_read_lock();
548
549	if (info->status.excessive_retries) {
550		sta = sta_info_get(local, hdr->addr1);
551		if (sta) {
552			if (test_sta_flags(sta, WLAN_STA_PS)) {
553				/*
554				 * The STA is in power save mode, so assume
555				 * that this TX packet failed because of that.
556				 */
557				ieee80211_handle_filtered_frame(local, sta, skb);
558				rcu_read_unlock();
559				return;
560			}
561		}
562	}
563
564	fc = hdr->frame_control;
565
566	if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
567	    (ieee80211_is_data_qos(fc))) {
568		u16 tid, ssn;
569		u8 *qc;
570		sta = sta_info_get(local, hdr->addr1);
571		if (sta) {
572			qc = ieee80211_get_qos_ctl(hdr);
573			tid = qc[0] & 0xf;
574			ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
575						& IEEE80211_SCTL_SEQ);
576			ieee80211_send_bar(sta->sdata, hdr->addr1,
577					   tid, ssn);
578		}
579	}
580
581	if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
582		sta = sta_info_get(local, hdr->addr1);
583		if (sta) {
584			ieee80211_handle_filtered_frame(local, sta, skb);
585			rcu_read_unlock();
586			return;
587		}
588	} else
589		rate_control_tx_status(local->mdev, skb);
590
591	rcu_read_unlock();
592
593	ieee80211_led_tx(local, 0);
594
595	/* SNMP counters
596	 * Fragments are passed to low-level drivers as separate skbs, so these
597	 * are actually fragments, not frames. Update frame counters only for
598	 * the first fragment of the frame. */
599
600	frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
601	type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
602
603	if (info->flags & IEEE80211_TX_STAT_ACK) {
604		if (frag == 0) {
605			local->dot11TransmittedFrameCount++;
606			if (is_multicast_ether_addr(hdr->addr1))
607				local->dot11MulticastTransmittedFrameCount++;
608			if (info->status.retry_count > 0)
609				local->dot11RetryCount++;
610			if (info->status.retry_count > 1)
611				local->dot11MultipleRetryCount++;
612		}
613
614		/* This counter shall be incremented for an acknowledged MPDU
615		 * with an individual address in the address 1 field or an MPDU
616		 * with a multicast address in the address 1 field of type Data
617		 * or Management. */
618		if (!is_multicast_ether_addr(hdr->addr1) ||
619		    type == IEEE80211_FTYPE_DATA ||
620		    type == IEEE80211_FTYPE_MGMT)
621			local->dot11TransmittedFragmentCount++;
622	} else {
623		if (frag == 0)
624			local->dot11FailedCount++;
625	}
626
627	/* this was a transmitted frame, but now we want to reuse it */
628	skb_orphan(skb);
629
630	/*
631	 * This is a bit racy but we can avoid a lot of work
632	 * with this test...
633	 */
634	if (!local->monitors && !local->cooked_mntrs) {
635		dev_kfree_skb(skb);
636		return;
637	}
638
639	/* send frame to monitor interfaces now */
640
641	if (skb_headroom(skb) < sizeof(*rthdr)) {
642		printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
643		dev_kfree_skb(skb);
644		return;
645	}
646
647	rthdr = (struct ieee80211_tx_status_rtap_hdr *)
648				skb_push(skb, sizeof(*rthdr));
649
650	memset(rthdr, 0, sizeof(*rthdr));
651	rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
652	rthdr->hdr.it_present =
653		cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
654			    (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
655
656	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
657	    !is_multicast_ether_addr(hdr->addr1))
658		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
659
660	if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
661	    (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
662		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
663	else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
664		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
665
666	rthdr->data_retries = info->status.retry_count;
667
668	/* XXX: is this sufficient for BPF? */
669	skb_set_mac_header(skb, 0);
670	skb->ip_summed = CHECKSUM_UNNECESSARY;
671	skb->pkt_type = PACKET_OTHERHOST;
672	skb->protocol = htons(ETH_P_802_2);
673	memset(skb->cb, 0, sizeof(skb->cb));
674
675	rcu_read_lock();
676	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
677		if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
678			if (!netif_running(sdata->dev))
679				continue;
680
681			if (prev_dev) {
682				skb2 = skb_clone(skb, GFP_ATOMIC);
683				if (skb2) {
684					skb2->dev = prev_dev;
685					netif_rx(skb2);
686				}
687			}
688
689			prev_dev = sdata->dev;
690		}
691	}
692	if (prev_dev) {
693		skb->dev = prev_dev;
694		netif_rx(skb);
695		skb = NULL;
696	}
697	rcu_read_unlock();
698	dev_kfree_skb(skb);
699}
700EXPORT_SYMBOL(ieee80211_tx_status);
701
702struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
703					const struct ieee80211_ops *ops)
704{
705	struct ieee80211_local *local;
706	int priv_size;
707	struct wiphy *wiphy;
708
709	/* Ensure 32-byte alignment of our private data and hw private data.
710	 * We use the wiphy priv data for both our ieee80211_local and for
711	 * the driver's private data
712	 *
713	 * In memory it'll be like this:
714	 *
715	 * +-------------------------+
716	 * | struct wiphy	    |
717	 * +-------------------------+
718	 * | struct ieee80211_local  |
719	 * +-------------------------+
720	 * | driver's private data   |
721	 * +-------------------------+
722	 *
723	 */
724	priv_size = ((sizeof(struct ieee80211_local) +
725		      NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
726		    priv_data_len;
727
728	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
729
730	if (!wiphy)
731		return NULL;
732
733	wiphy->privid = mac80211_wiphy_privid;
734
735	local = wiphy_priv(wiphy);
736	local->hw.wiphy = wiphy;
737
738	local->hw.priv = (char *)local +
739			 ((sizeof(struct ieee80211_local) +
740			   NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
741
742	BUG_ON(!ops->tx);
743	BUG_ON(!ops->start);
744	BUG_ON(!ops->stop);
745	BUG_ON(!ops->config);
746	BUG_ON(!ops->add_interface);
747	BUG_ON(!ops->remove_interface);
748	BUG_ON(!ops->configure_filter);
749	local->ops = ops;
750
751	local->hw.queues = 1; /* default */
752
753	local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
754	local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
755	local->short_retry_limit = 7;
756	local->long_retry_limit = 4;
757	local->hw.conf.radio_enabled = 1;
758
759	INIT_LIST_HEAD(&local->interfaces);
760
761	spin_lock_init(&local->key_lock);
762
763	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
764
765	sta_info_init(local);
766
767	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
768		     (unsigned long)local);
769	tasklet_disable(&local->tx_pending_tasklet);
770
771	tasklet_init(&local->tasklet,
772		     ieee80211_tasklet_handler,
773		     (unsigned long) local);
774	tasklet_disable(&local->tasklet);
775
776	skb_queue_head_init(&local->skb_queue);
777	skb_queue_head_init(&local->skb_queue_unreliable);
778
779	return local_to_hw(local);
780}
781EXPORT_SYMBOL(ieee80211_alloc_hw);
782
783int ieee80211_register_hw(struct ieee80211_hw *hw)
784{
785	struct ieee80211_local *local = hw_to_local(hw);
786	const char *name;
787	int result;
788	enum ieee80211_band band;
789	struct net_device *mdev;
790	struct wireless_dev *mwdev;
791
792	/*
793	 * generic code guarantees at least one band,
794	 * set this very early because much code assumes
795	 * that hw.conf.channel is assigned
796	 */
797	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
798		struct ieee80211_supported_band *sband;
799
800		sband = local->hw.wiphy->bands[band];
801		if (sband) {
802			/* init channel we're on */
803			local->hw.conf.channel =
804			local->oper_channel =
805			local->scan_channel = &sband->channels[0];
806			break;
807		}
808	}
809
810	/* if low-level driver supports AP, we also support VLAN */
811	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
812		local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
813
814	/* mac80211 always supports monitor */
815	local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
816
817	result = wiphy_register(local->hw.wiphy);
818	if (result < 0)
819		return result;
820
821	/*
822	 * We use the number of queues for feature tests (QoS, HT) internally
823	 * so restrict them appropriately.
824	 */
825	if (hw->queues > IEEE80211_MAX_QUEUES)
826		hw->queues = IEEE80211_MAX_QUEUES;
827	if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
828		hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
829	if (hw->queues < 4)
830		hw->ampdu_queues = 0;
831
832	mdev = alloc_netdev_mq(sizeof(struct wireless_dev),
833			       "wmaster%d", ether_setup,
834			       ieee80211_num_queues(hw));
835	if (!mdev)
836		goto fail_mdev_alloc;
837
838	mwdev = netdev_priv(mdev);
839	mdev->ieee80211_ptr = mwdev;
840	mwdev->wiphy = local->hw.wiphy;
841
842	local->mdev = mdev;
843
844	ieee80211_rx_bss_list_init(local);
845
846	mdev->hard_start_xmit = ieee80211_master_start_xmit;
847	mdev->open = ieee80211_master_open;
848	mdev->stop = ieee80211_master_stop;
849	mdev->type = ARPHRD_IEEE80211;
850	mdev->header_ops = &ieee80211_header_ops;
851	mdev->set_multicast_list = ieee80211_master_set_multicast_list;
852
853	name = wiphy_dev(local->hw.wiphy)->driver->name;
854	local->hw.workqueue = create_freezeable_workqueue(name);
855	if (!local->hw.workqueue) {
856		result = -ENOMEM;
857		goto fail_workqueue;
858	}
859
860	/*
861	 * The hardware needs headroom for sending the frame,
862	 * and we need some headroom for passing the frame to monitor
863	 * interfaces, but never both at the same time.
864	 */
865	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
866				   sizeof(struct ieee80211_tx_status_rtap_hdr));
867
868	debugfs_hw_add(local);
869
870	if (local->hw.conf.beacon_int < 10)
871		local->hw.conf.beacon_int = 100;
872
873	if (local->hw.max_listen_interval == 0)
874		local->hw.max_listen_interval = 1;
875
876	local->hw.conf.listen_interval = local->hw.max_listen_interval;
877
878	local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
879						  IEEE80211_HW_SIGNAL_DB |
880						  IEEE80211_HW_SIGNAL_DBM) ?
881			       IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
882	local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
883			       IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
884	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
885		local->wstats_flags |= IW_QUAL_DBM;
886
887	result = sta_info_start(local);
888	if (result < 0)
889		goto fail_sta_info;
890
891	rtnl_lock();
892	result = dev_alloc_name(local->mdev, local->mdev->name);
893	if (result < 0)
894		goto fail_dev;
895
896	memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
897	SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
898
899	result = register_netdevice(local->mdev);
900	if (result < 0)
901		goto fail_dev;
902
903	result = ieee80211_init_rate_ctrl_alg(local,
904					      hw->rate_control_algorithm);
905	if (result < 0) {
906		printk(KERN_DEBUG "%s: Failed to initialize rate control "
907		       "algorithm\n", wiphy_name(local->hw.wiphy));
908		goto fail_rate;
909	}
910
911	result = ieee80211_wep_init(local);
912
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	local->mdev->select_queue = ieee80211_select_queue;
920
921	/* add one default STA interface */
922	result = ieee80211_if_add(local, "wlan%d", NULL,
923				  NL80211_IFTYPE_STATION, NULL);
924	if (result)
925		printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
926		       wiphy_name(local->hw.wiphy));
927
928	rtnl_unlock();
929
930	ieee80211_led_init(local);
931
932	return 0;
933
934fail_wep:
935	rate_control_deinitialize(local);
936fail_rate:
937	unregister_netdevice(local->mdev);
938	local->mdev = NULL;
939fail_dev:
940	rtnl_unlock();
941	sta_info_stop(local);
942fail_sta_info:
943	debugfs_hw_del(local);
944	destroy_workqueue(local->hw.workqueue);
945fail_workqueue:
946	if (local->mdev)
947		free_netdev(local->mdev);
948fail_mdev_alloc:
949	wiphy_unregister(local->hw.wiphy);
950	return result;
951}
952EXPORT_SYMBOL(ieee80211_register_hw);
953
954void ieee80211_unregister_hw(struct ieee80211_hw *hw)
955{
956	struct ieee80211_local *local = hw_to_local(hw);
957
958	tasklet_kill(&local->tx_pending_tasklet);
959	tasklet_kill(&local->tasklet);
960
961	rtnl_lock();
962
963	/*
964	 * At this point, interface list manipulations are fine
965	 * because the driver cannot be handing us frames any
966	 * more and the tasklet is killed.
967	 */
968
969	/* First, we remove all virtual interfaces. */
970	ieee80211_remove_interfaces(local);
971
972	/* then, finally, remove the master interface */
973	unregister_netdevice(local->mdev);
974
975	rtnl_unlock();
976
977	ieee80211_rx_bss_list_deinit(local);
978	ieee80211_clear_tx_pending(local);
979	sta_info_stop(local);
980	rate_control_deinitialize(local);
981	debugfs_hw_del(local);
982
983	if (skb_queue_len(&local->skb_queue)
984			|| skb_queue_len(&local->skb_queue_unreliable))
985		printk(KERN_WARNING "%s: skb_queue not empty\n",
986		       wiphy_name(local->hw.wiphy));
987	skb_queue_purge(&local->skb_queue);
988	skb_queue_purge(&local->skb_queue_unreliable);
989
990	destroy_workqueue(local->hw.workqueue);
991	wiphy_unregister(local->hw.wiphy);
992	ieee80211_wep_free(local);
993	ieee80211_led_exit(local);
994	free_netdev(local->mdev);
995}
996EXPORT_SYMBOL(ieee80211_unregister_hw);
997
998void ieee80211_free_hw(struct ieee80211_hw *hw)
999{
1000	struct ieee80211_local *local = hw_to_local(hw);
1001
1002	wiphy_free(local->hw.wiphy);
1003}
1004EXPORT_SYMBOL(ieee80211_free_hw);
1005
1006static int __init ieee80211_init(void)
1007{
1008	struct sk_buff *skb;
1009	int ret;
1010
1011	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1012	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1013	             IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1014
1015	ret = rc80211_pid_init();
1016	if (ret)
1017		return ret;
1018
1019	ieee80211_debugfs_netdev_init();
1020
1021	return 0;
1022}
1023
1024static void __exit ieee80211_exit(void)
1025{
1026	rc80211_pid_exit();
1027
1028	/*
1029	 * For key todo, it'll be empty by now but the work
1030	 * might still be scheduled.
1031	 */
1032	flush_scheduled_work();
1033
1034	if (mesh_allocated)
1035		ieee80211s_stop();
1036
1037	ieee80211_debugfs_netdev_exit();
1038}
1039
1040
1041subsys_initcall(ieee80211_init);
1042module_exit(ieee80211_exit);
1043
1044MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1045MODULE_LICENSE("GPL");
1046