main.c revision d9fe60dea7779d412b34679f1177c5ca1940ea8d 
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_master_priv *mpriv = netdev_priv(dev);
110	struct ieee80211_local *local = mpriv->local;
111	struct ieee80211_sub_if_data *sdata;
112	int res = -EOPNOTSUPP;
113
114	/* we hold the RTNL here so can safely walk the list */
115	list_for_each_entry(sdata, &local->interfaces, list) {
116		if (netif_running(sdata->dev)) {
117			res = 0;
118			break;
119		}
120	}
121
122	if (res)
123		return res;
124
125	netif_tx_start_all_queues(local->mdev);
126
127	return 0;
128}
129
130static int ieee80211_master_stop(struct net_device *dev)
131{
132	struct ieee80211_master_priv *mpriv = netdev_priv(dev);
133	struct ieee80211_local *local = mpriv->local;
134	struct ieee80211_sub_if_data *sdata;
135
136	/* we hold the RTNL here so can safely walk the list */
137	list_for_each_entry(sdata, &local->interfaces, list)
138		if (netif_running(sdata->dev))
139			dev_close(sdata->dev);
140
141	return 0;
142}
143
144static void ieee80211_master_set_multicast_list(struct net_device *dev)
145{
146	struct ieee80211_master_priv *mpriv = netdev_priv(dev);
147	struct ieee80211_local *local = mpriv->local;
148
149	ieee80211_configure_filter(local);
150}
151
152/* everything else */
153
154int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
155{
156	struct ieee80211_local *local = sdata->local;
157	struct ieee80211_if_conf conf;
158
159	if (WARN_ON(!netif_running(sdata->dev)))
160		return 0;
161
162	if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
163		return -EINVAL;
164
165	if (!local->ops->config_interface)
166		return 0;
167
168	memset(&conf, 0, sizeof(conf));
169	conf.changed = changed;
170
171	if (sdata->vif.type == NL80211_IFTYPE_STATION ||
172	    sdata->vif.type == NL80211_IFTYPE_ADHOC) {
173		conf.bssid = sdata->u.sta.bssid;
174		conf.ssid = sdata->u.sta.ssid;
175		conf.ssid_len = sdata->u.sta.ssid_len;
176	} else if (sdata->vif.type == NL80211_IFTYPE_AP) {
177		conf.bssid = sdata->dev->dev_addr;
178		conf.ssid = sdata->u.ap.ssid;
179		conf.ssid_len = sdata->u.ap.ssid_len;
180	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
181		u8 zero[ETH_ALEN] = { 0 };
182		conf.bssid = zero;
183		conf.ssid = zero;
184		conf.ssid_len = 0;
185	} else {
186		WARN_ON(1);
187		return -EINVAL;
188	}
189
190	if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
191		return -EINVAL;
192
193	if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
194		return -EINVAL;
195
196	return local->ops->config_interface(local_to_hw(local),
197					    &sdata->vif, &conf);
198}
199
200int ieee80211_hw_config(struct ieee80211_local *local)
201{
202	struct ieee80211_channel *chan;
203	int ret = 0;
204
205	if (local->sw_scanning)
206		chan = local->scan_channel;
207	else
208		chan = local->oper_channel;
209
210	local->hw.conf.channel = chan;
211
212	if (!local->hw.conf.power_level)
213		local->hw.conf.power_level = chan->max_power;
214	else
215		local->hw.conf.power_level = min(chan->max_power,
216					       local->hw.conf.power_level);
217
218#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
219	printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
220	       wiphy_name(local->hw.wiphy), chan->center_freq);
221#endif
222
223	if (local->open_count) {
224		ret = local->ops->config(local_to_hw(local), &local->hw.conf);
225		/*
226		 * HW reconfiguration should never fail, the driver has told
227		 * us what it can support so it should live up to that promise.
228		 */
229		WARN_ON(ret);
230	}
231
232	return ret;
233}
234
235void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
236				      u32 changed)
237{
238	struct ieee80211_local *local = sdata->local;
239
240	if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
241		return;
242
243	if (!changed)
244		return;
245
246	if (local->ops->bss_info_changed)
247		local->ops->bss_info_changed(local_to_hw(local),
248					     &sdata->vif,
249					     &sdata->bss_conf,
250					     changed);
251}
252
253u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
254{
255	sdata->bss_conf.use_cts_prot = false;
256	sdata->bss_conf.use_short_preamble = false;
257	sdata->bss_conf.use_short_slot = false;
258	return BSS_CHANGED_ERP_CTS_PROT |
259	       BSS_CHANGED_ERP_PREAMBLE |
260	       BSS_CHANGED_ERP_SLOT;
261}
262
263void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
264				 struct sk_buff *skb)
265{
266	struct ieee80211_local *local = hw_to_local(hw);
267	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
268	int tmp;
269
270	skb->dev = local->mdev;
271	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
272	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
273		       &local->skb_queue : &local->skb_queue_unreliable, skb);
274	tmp = skb_queue_len(&local->skb_queue) +
275		skb_queue_len(&local->skb_queue_unreliable);
276	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
277	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
278		dev_kfree_skb_irq(skb);
279		tmp--;
280		I802_DEBUG_INC(local->tx_status_drop);
281	}
282	tasklet_schedule(&local->tasklet);
283}
284EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
285
286static void ieee80211_tasklet_handler(unsigned long data)
287{
288	struct ieee80211_local *local = (struct ieee80211_local *) data;
289	struct sk_buff *skb;
290	struct ieee80211_rx_status rx_status;
291	struct ieee80211_ra_tid *ra_tid;
292
293	while ((skb = skb_dequeue(&local->skb_queue)) ||
294	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
295		switch (skb->pkt_type) {
296		case IEEE80211_RX_MSG:
297			/* status is in skb->cb */
298			memcpy(&rx_status, skb->cb, sizeof(rx_status));
299			/* Clear skb->pkt_type in order to not confuse kernel
300			 * netstack. */
301			skb->pkt_type = 0;
302			__ieee80211_rx(local_to_hw(local), skb, &rx_status);
303			break;
304		case IEEE80211_TX_STATUS_MSG:
305			skb->pkt_type = 0;
306			ieee80211_tx_status(local_to_hw(local), skb);
307			break;
308		case IEEE80211_DELBA_MSG:
309			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
310			ieee80211_stop_tx_ba_cb(local_to_hw(local),
311						ra_tid->ra, ra_tid->tid);
312			dev_kfree_skb(skb);
313			break;
314		case IEEE80211_ADDBA_MSG:
315			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
316			ieee80211_start_tx_ba_cb(local_to_hw(local),
317						 ra_tid->ra, ra_tid->tid);
318			dev_kfree_skb(skb);
319			break ;
320		default:
321			WARN_ON(1);
322			dev_kfree_skb(skb);
323			break;
324		}
325	}
326}
327
328/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
329 * make a prepared TX frame (one that has been given to hw) to look like brand
330 * new IEEE 802.11 frame that is ready to go through TX processing again.
331 */
332static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
333				      struct ieee80211_key *key,
334				      struct sk_buff *skb)
335{
336	unsigned int hdrlen, iv_len, mic_len;
337	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
338
339	hdrlen = ieee80211_hdrlen(hdr->frame_control);
340
341	if (!key)
342		goto no_key;
343
344	switch (key->conf.alg) {
345	case ALG_WEP:
346		iv_len = WEP_IV_LEN;
347		mic_len = WEP_ICV_LEN;
348		break;
349	case ALG_TKIP:
350		iv_len = TKIP_IV_LEN;
351		mic_len = TKIP_ICV_LEN;
352		break;
353	case ALG_CCMP:
354		iv_len = CCMP_HDR_LEN;
355		mic_len = CCMP_MIC_LEN;
356		break;
357	default:
358		goto no_key;
359	}
360
361	if (skb->len >= hdrlen + mic_len &&
362	    !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
363		skb_trim(skb, skb->len - mic_len);
364	if (skb->len >= hdrlen + iv_len) {
365		memmove(skb->data + iv_len, skb->data, hdrlen);
366		hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
367	}
368
369no_key:
370	if (ieee80211_is_data_qos(hdr->frame_control)) {
371		hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
372		memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
373			hdrlen - IEEE80211_QOS_CTL_LEN);
374		skb_pull(skb, IEEE80211_QOS_CTL_LEN);
375	}
376}
377
378static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
379					    struct sta_info *sta,
380					    struct sk_buff *skb)
381{
382	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
383
384	sta->tx_filtered_count++;
385
386	/*
387	 * Clear the TX filter mask for this STA when sending the next
388	 * packet. If the STA went to power save mode, this will happen
389	 * when it wakes up for the next time.
390	 */
391	set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
392
393	/*
394	 * This code races in the following way:
395	 *
396	 *  (1) STA sends frame indicating it will go to sleep and does so
397	 *  (2) hardware/firmware adds STA to filter list, passes frame up
398	 *  (3) hardware/firmware processes TX fifo and suppresses a frame
399	 *  (4) we get TX status before having processed the frame and
400	 *	knowing that the STA has gone to sleep.
401	 *
402	 * This is actually quite unlikely even when both those events are
403	 * processed from interrupts coming in quickly after one another or
404	 * even at the same time because we queue both TX status events and
405	 * RX frames to be processed by a tasklet and process them in the
406	 * same order that they were received or TX status last. Hence, there
407	 * is no race as long as the frame RX is processed before the next TX
408	 * status, which drivers can ensure, see below.
409	 *
410	 * Note that this can only happen if the hardware or firmware can
411	 * actually add STAs to the filter list, if this is done by the
412	 * driver in response to set_tim() (which will only reduce the race
413	 * this whole filtering tries to solve, not completely solve it)
414	 * this situation cannot happen.
415	 *
416	 * To completely solve this race drivers need to make sure that they
417	 *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
418	 *	functions and
419	 *  (b) always process RX events before TX status events if ordering
420	 *      can be unknown, for example with different interrupt status
421	 *	bits.
422	 */
423	if (test_sta_flags(sta, WLAN_STA_PS) &&
424	    skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
425		ieee80211_remove_tx_extra(local, sta->key, skb);
426		skb_queue_tail(&sta->tx_filtered, skb);
427		return;
428	}
429
430	if (!test_sta_flags(sta, WLAN_STA_PS) &&
431	    !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
432		/* Software retry the packet once */
433		info->flags |= IEEE80211_TX_CTL_REQUEUE;
434		ieee80211_remove_tx_extra(local, sta->key, skb);
435		dev_queue_xmit(skb);
436		return;
437	}
438
439#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
440	if (net_ratelimit())
441		printk(KERN_DEBUG "%s: dropped TX filtered frame, "
442		       "queue_len=%d PS=%d @%lu\n",
443		       wiphy_name(local->hw.wiphy),
444		       skb_queue_len(&sta->tx_filtered),
445		       !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
446#endif
447	dev_kfree_skb(skb);
448}
449
450void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
451{
452	struct sk_buff *skb2;
453	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
454	struct ieee80211_local *local = hw_to_local(hw);
455	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
456	u16 frag, type;
457	__le16 fc;
458	struct ieee80211_supported_band *sband;
459	struct ieee80211_tx_status_rtap_hdr *rthdr;
460	struct ieee80211_sub_if_data *sdata;
461	struct net_device *prev_dev = NULL;
462	struct sta_info *sta;
463
464	rcu_read_lock();
465
466	sta = sta_info_get(local, hdr->addr1);
467
468	if (sta) {
469		if (info->status.excessive_retries &&
470		    test_sta_flags(sta, WLAN_STA_PS)) {
471			/*
472			 * The STA is in power save mode, so assume
473			 * that this TX packet failed because of that.
474			 */
475			ieee80211_handle_filtered_frame(local, sta, skb);
476			rcu_read_unlock();
477			return;
478		}
479
480		fc = hdr->frame_control;
481
482		if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
483		    (ieee80211_is_data_qos(fc))) {
484			u16 tid, ssn;
485			u8 *qc;
486
487			qc = ieee80211_get_qos_ctl(hdr);
488			tid = qc[0] & 0xf;
489			ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
490						& IEEE80211_SCTL_SEQ);
491			ieee80211_send_bar(sta->sdata, hdr->addr1,
492					   tid, ssn);
493		}
494
495		if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
496			ieee80211_handle_filtered_frame(local, sta, skb);
497			rcu_read_unlock();
498			return;
499		} else {
500			if (info->status.excessive_retries)
501				sta->tx_retry_failed++;
502			sta->tx_retry_count += info->status.retry_count;
503		}
504
505		sband = local->hw.wiphy->bands[info->band];
506		rate_control_tx_status(local, sband, sta, skb);
507	}
508
509	rcu_read_unlock();
510
511	ieee80211_led_tx(local, 0);
512
513	/* SNMP counters
514	 * Fragments are passed to low-level drivers as separate skbs, so these
515	 * are actually fragments, not frames. Update frame counters only for
516	 * the first fragment of the frame. */
517
518	frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
519	type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
520
521	if (info->flags & IEEE80211_TX_STAT_ACK) {
522		if (frag == 0) {
523			local->dot11TransmittedFrameCount++;
524			if (is_multicast_ether_addr(hdr->addr1))
525				local->dot11MulticastTransmittedFrameCount++;
526			if (info->status.retry_count > 0)
527				local->dot11RetryCount++;
528			if (info->status.retry_count > 1)
529				local->dot11MultipleRetryCount++;
530		}
531
532		/* This counter shall be incremented for an acknowledged MPDU
533		 * with an individual address in the address 1 field or an MPDU
534		 * with a multicast address in the address 1 field of type Data
535		 * or Management. */
536		if (!is_multicast_ether_addr(hdr->addr1) ||
537		    type == IEEE80211_FTYPE_DATA ||
538		    type == IEEE80211_FTYPE_MGMT)
539			local->dot11TransmittedFragmentCount++;
540	} else {
541		if (frag == 0)
542			local->dot11FailedCount++;
543	}
544
545	/* this was a transmitted frame, but now we want to reuse it */
546	skb_orphan(skb);
547
548	/*
549	 * This is a bit racy but we can avoid a lot of work
550	 * with this test...
551	 */
552	if (!local->monitors && !local->cooked_mntrs) {
553		dev_kfree_skb(skb);
554		return;
555	}
556
557	/* send frame to monitor interfaces now */
558
559	if (skb_headroom(skb) < sizeof(*rthdr)) {
560		printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
561		dev_kfree_skb(skb);
562		return;
563	}
564
565	rthdr = (struct ieee80211_tx_status_rtap_hdr *)
566				skb_push(skb, sizeof(*rthdr));
567
568	memset(rthdr, 0, sizeof(*rthdr));
569	rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
570	rthdr->hdr.it_present =
571		cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
572			    (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
573
574	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
575	    !is_multicast_ether_addr(hdr->addr1))
576		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
577
578	if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
579	    (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
580		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
581	else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
582		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
583
584	rthdr->data_retries = info->status.retry_count;
585
586	/* XXX: is this sufficient for BPF? */
587	skb_set_mac_header(skb, 0);
588	skb->ip_summed = CHECKSUM_UNNECESSARY;
589	skb->pkt_type = PACKET_OTHERHOST;
590	skb->protocol = htons(ETH_P_802_2);
591	memset(skb->cb, 0, sizeof(skb->cb));
592
593	rcu_read_lock();
594	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
595		if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
596			if (!netif_running(sdata->dev))
597				continue;
598
599			if (prev_dev) {
600				skb2 = skb_clone(skb, GFP_ATOMIC);
601				if (skb2) {
602					skb2->dev = prev_dev;
603					netif_rx(skb2);
604				}
605			}
606
607			prev_dev = sdata->dev;
608		}
609	}
610	if (prev_dev) {
611		skb->dev = prev_dev;
612		netif_rx(skb);
613		skb = NULL;
614	}
615	rcu_read_unlock();
616	dev_kfree_skb(skb);
617}
618EXPORT_SYMBOL(ieee80211_tx_status);
619
620struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
621					const struct ieee80211_ops *ops)
622{
623	struct ieee80211_local *local;
624	int priv_size;
625	struct wiphy *wiphy;
626
627	/* Ensure 32-byte alignment of our private data and hw private data.
628	 * We use the wiphy priv data for both our ieee80211_local and for
629	 * the driver's private data
630	 *
631	 * In memory it'll be like this:
632	 *
633	 * +-------------------------+
634	 * | struct wiphy	    |
635	 * +-------------------------+
636	 * | struct ieee80211_local  |
637	 * +-------------------------+
638	 * | driver's private data   |
639	 * +-------------------------+
640	 *
641	 */
642	priv_size = ((sizeof(struct ieee80211_local) +
643		      NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
644		    priv_data_len;
645
646	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
647
648	if (!wiphy)
649		return NULL;
650
651	wiphy->privid = mac80211_wiphy_privid;
652
653	local = wiphy_priv(wiphy);
654	local->hw.wiphy = wiphy;
655
656	local->hw.priv = (char *)local +
657			 ((sizeof(struct ieee80211_local) +
658			   NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
659
660	BUG_ON(!ops->tx);
661	BUG_ON(!ops->start);
662	BUG_ON(!ops->stop);
663	BUG_ON(!ops->config);
664	BUG_ON(!ops->add_interface);
665	BUG_ON(!ops->remove_interface);
666	BUG_ON(!ops->configure_filter);
667	local->ops = ops;
668
669	local->hw.queues = 1; /* default */
670
671	local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
672	local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
673	local->short_retry_limit = 7;
674	local->long_retry_limit = 4;
675	local->hw.conf.radio_enabled = 1;
676
677	INIT_LIST_HEAD(&local->interfaces);
678
679	spin_lock_init(&local->key_lock);
680
681	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
682
683	sta_info_init(local);
684
685	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
686		     (unsigned long)local);
687	tasklet_disable(&local->tx_pending_tasklet);
688
689	tasklet_init(&local->tasklet,
690		     ieee80211_tasklet_handler,
691		     (unsigned long) local);
692	tasklet_disable(&local->tasklet);
693
694	skb_queue_head_init(&local->skb_queue);
695	skb_queue_head_init(&local->skb_queue_unreliable);
696
697	return local_to_hw(local);
698}
699EXPORT_SYMBOL(ieee80211_alloc_hw);
700
701int ieee80211_register_hw(struct ieee80211_hw *hw)
702{
703	struct ieee80211_local *local = hw_to_local(hw);
704	const char *name;
705	int result;
706	enum ieee80211_band band;
707	struct net_device *mdev;
708	struct ieee80211_master_priv *mpriv;
709
710	/*
711	 * generic code guarantees at least one band,
712	 * set this very early because much code assumes
713	 * that hw.conf.channel is assigned
714	 */
715	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
716		struct ieee80211_supported_band *sband;
717
718		sband = local->hw.wiphy->bands[band];
719		if (sband) {
720			/* init channel we're on */
721			local->hw.conf.channel =
722			local->oper_channel =
723			local->scan_channel = &sband->channels[0];
724			break;
725		}
726	}
727
728	/* if low-level driver supports AP, we also support VLAN */
729	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
730		local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
731
732	/* mac80211 always supports monitor */
733	local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
734
735	result = wiphy_register(local->hw.wiphy);
736	if (result < 0)
737		return result;
738
739	/*
740	 * We use the number of queues for feature tests (QoS, HT) internally
741	 * so restrict them appropriately.
742	 */
743	if (hw->queues > IEEE80211_MAX_QUEUES)
744		hw->queues = IEEE80211_MAX_QUEUES;
745	if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
746		hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
747	if (hw->queues < 4)
748		hw->ampdu_queues = 0;
749
750	mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
751			       "wmaster%d", ether_setup,
752			       ieee80211_num_queues(hw));
753	if (!mdev)
754		goto fail_mdev_alloc;
755
756	mpriv = netdev_priv(mdev);
757	mpriv->local = local;
758	local->mdev = mdev;
759
760	ieee80211_rx_bss_list_init(local);
761
762	mdev->hard_start_xmit = ieee80211_master_start_xmit;
763	mdev->open = ieee80211_master_open;
764	mdev->stop = ieee80211_master_stop;
765	mdev->type = ARPHRD_IEEE80211;
766	mdev->header_ops = &ieee80211_header_ops;
767	mdev->set_multicast_list = ieee80211_master_set_multicast_list;
768
769	name = wiphy_dev(local->hw.wiphy)->driver->name;
770	local->hw.workqueue = create_freezeable_workqueue(name);
771	if (!local->hw.workqueue) {
772		result = -ENOMEM;
773		goto fail_workqueue;
774	}
775
776	/*
777	 * The hardware needs headroom for sending the frame,
778	 * and we need some headroom for passing the frame to monitor
779	 * interfaces, but never both at the same time.
780	 */
781	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
782				   sizeof(struct ieee80211_tx_status_rtap_hdr));
783
784	debugfs_hw_add(local);
785
786	if (local->hw.conf.beacon_int < 10)
787		local->hw.conf.beacon_int = 100;
788
789	if (local->hw.max_listen_interval == 0)
790		local->hw.max_listen_interval = 1;
791
792	local->hw.conf.listen_interval = local->hw.max_listen_interval;
793
794	local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
795						  IEEE80211_HW_SIGNAL_DB |
796						  IEEE80211_HW_SIGNAL_DBM) ?
797			       IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
798	local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
799			       IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
800	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
801		local->wstats_flags |= IW_QUAL_DBM;
802
803	result = sta_info_start(local);
804	if (result < 0)
805		goto fail_sta_info;
806
807	rtnl_lock();
808	result = dev_alloc_name(local->mdev, local->mdev->name);
809	if (result < 0)
810		goto fail_dev;
811
812	memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
813	SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
814
815	result = register_netdevice(local->mdev);
816	if (result < 0)
817		goto fail_dev;
818
819	result = ieee80211_init_rate_ctrl_alg(local,
820					      hw->rate_control_algorithm);
821	if (result < 0) {
822		printk(KERN_DEBUG "%s: Failed to initialize rate control "
823		       "algorithm\n", wiphy_name(local->hw.wiphy));
824		goto fail_rate;
825	}
826
827	result = ieee80211_wep_init(local);
828
829	if (result < 0) {
830		printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
831		       wiphy_name(local->hw.wiphy), result);
832		goto fail_wep;
833	}
834
835	local->mdev->select_queue = ieee80211_select_queue;
836
837	/* add one default STA interface */
838	result = ieee80211_if_add(local, "wlan%d", NULL,
839				  NL80211_IFTYPE_STATION, NULL);
840	if (result)
841		printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
842		       wiphy_name(local->hw.wiphy));
843
844	rtnl_unlock();
845
846	ieee80211_led_init(local);
847
848	return 0;
849
850fail_wep:
851	rate_control_deinitialize(local);
852fail_rate:
853	unregister_netdevice(local->mdev);
854	local->mdev = NULL;
855fail_dev:
856	rtnl_unlock();
857	sta_info_stop(local);
858fail_sta_info:
859	debugfs_hw_del(local);
860	destroy_workqueue(local->hw.workqueue);
861fail_workqueue:
862	if (local->mdev)
863		free_netdev(local->mdev);
864fail_mdev_alloc:
865	wiphy_unregister(local->hw.wiphy);
866	return result;
867}
868EXPORT_SYMBOL(ieee80211_register_hw);
869
870void ieee80211_unregister_hw(struct ieee80211_hw *hw)
871{
872	struct ieee80211_local *local = hw_to_local(hw);
873
874	tasklet_kill(&local->tx_pending_tasklet);
875	tasklet_kill(&local->tasklet);
876
877	rtnl_lock();
878
879	/*
880	 * At this point, interface list manipulations are fine
881	 * because the driver cannot be handing us frames any
882	 * more and the tasklet is killed.
883	 */
884
885	/* First, we remove all virtual interfaces. */
886	ieee80211_remove_interfaces(local);
887
888	/* then, finally, remove the master interface */
889	unregister_netdevice(local->mdev);
890
891	rtnl_unlock();
892
893	ieee80211_rx_bss_list_deinit(local);
894	ieee80211_clear_tx_pending(local);
895	sta_info_stop(local);
896	rate_control_deinitialize(local);
897	debugfs_hw_del(local);
898
899	if (skb_queue_len(&local->skb_queue)
900			|| skb_queue_len(&local->skb_queue_unreliable))
901		printk(KERN_WARNING "%s: skb_queue not empty\n",
902		       wiphy_name(local->hw.wiphy));
903	skb_queue_purge(&local->skb_queue);
904	skb_queue_purge(&local->skb_queue_unreliable);
905
906	destroy_workqueue(local->hw.workqueue);
907	wiphy_unregister(local->hw.wiphy);
908	ieee80211_wep_free(local);
909	ieee80211_led_exit(local);
910	free_netdev(local->mdev);
911}
912EXPORT_SYMBOL(ieee80211_unregister_hw);
913
914void ieee80211_free_hw(struct ieee80211_hw *hw)
915{
916	struct ieee80211_local *local = hw_to_local(hw);
917
918	wiphy_free(local->hw.wiphy);
919}
920EXPORT_SYMBOL(ieee80211_free_hw);
921
922static int __init ieee80211_init(void)
923{
924	struct sk_buff *skb;
925	int ret;
926
927	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
928	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
929		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
930
931	ret = rc80211_minstrel_init();
932	if (ret)
933		return ret;
934
935	ret = rc80211_pid_init();
936	if (ret)
937		return ret;
938
939	ieee80211_debugfs_netdev_init();
940
941	return 0;
942}
943
944static void __exit ieee80211_exit(void)
945{
946	rc80211_pid_exit();
947	rc80211_minstrel_exit();
948
949	/*
950	 * For key todo, it'll be empty by now but the work
951	 * might still be scheduled.
952	 */
953	flush_scheduled_work();
954
955	if (mesh_allocated)
956		ieee80211s_stop();
957
958	ieee80211_debugfs_netdev_exit();
959}
960
961
962subsys_initcall(ieee80211_init);
963module_exit(ieee80211_exit);
964
965MODULE_DESCRIPTION("IEEE 802.11 subsystem");
966MODULE_LICENSE("GPL");
967