main.c revision e8db0be1245de16a6cc6365506abc392c3c212d4 
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 <linux/module.h>
13#include <linux/init.h>
14#include <linux/netdevice.h>
15#include <linux/types.h>
16#include <linux/slab.h>
17#include <linux/skbuff.h>
18#include <linux/etherdevice.h>
19#include <linux/if_arp.h>
20#include <linux/rtnetlink.h>
21#include <linux/bitmap.h>
22#include <linux/pm_qos.h>
23#include <linux/inetdevice.h>
24#include <net/net_namespace.h>
25#include <net/cfg80211.h>
26
27#include "ieee80211_i.h"
28#include "driver-ops.h"
29#include "rate.h"
30#include "mesh.h"
31#include "wep.h"
32#include "led.h"
33#include "cfg.h"
34#include "debugfs.h"
35
36static struct lock_class_key ieee80211_rx_skb_queue_class;
37
38void ieee80211_configure_filter(struct ieee80211_local *local)
39{
40	u64 mc;
41	unsigned int changed_flags;
42	unsigned int new_flags = 0;
43
44	if (atomic_read(&local->iff_promiscs))
45		new_flags |= FIF_PROMISC_IN_BSS;
46
47	if (atomic_read(&local->iff_allmultis))
48		new_flags |= FIF_ALLMULTI;
49
50	if (local->monitors || local->scanning)
51		new_flags |= FIF_BCN_PRBRESP_PROMISC;
52
53	if (local->fif_probe_req || local->probe_req_reg)
54		new_flags |= FIF_PROBE_REQ;
55
56	if (local->fif_fcsfail)
57		new_flags |= FIF_FCSFAIL;
58
59	if (local->fif_plcpfail)
60		new_flags |= FIF_PLCPFAIL;
61
62	if (local->fif_control)
63		new_flags |= FIF_CONTROL;
64
65	if (local->fif_other_bss)
66		new_flags |= FIF_OTHER_BSS;
67
68	if (local->fif_pspoll)
69		new_flags |= FIF_PSPOLL;
70
71	spin_lock_bh(&local->filter_lock);
72	changed_flags = local->filter_flags ^ new_flags;
73
74	mc = drv_prepare_multicast(local, &local->mc_list);
75	spin_unlock_bh(&local->filter_lock);
76
77	/* be a bit nasty */
78	new_flags |= (1<<31);
79
80	drv_configure_filter(local, changed_flags, &new_flags, mc);
81
82	WARN_ON(new_flags & (1<<31));
83
84	local->filter_flags = new_flags & ~(1<<31);
85}
86
87static void ieee80211_reconfig_filter(struct work_struct *work)
88{
89	struct ieee80211_local *local =
90		container_of(work, struct ieee80211_local, reconfig_filter);
91
92	ieee80211_configure_filter(local);
93}
94
95/*
96 * Returns true if we are logically configured to be on
97 * the operating channel AND the hardware-conf is currently
98 * configured on the operating channel.  Compares channel-type
99 * as well.
100 */
101bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local)
102{
103	struct ieee80211_channel *chan, *scan_chan;
104	enum nl80211_channel_type channel_type;
105
106	/* This logic needs to match logic in ieee80211_hw_config */
107	if (local->scan_channel) {
108		chan = local->scan_channel;
109		/* If scanning on oper channel, use whatever channel-type
110		 * is currently in use.
111		 */
112		if (chan == local->oper_channel)
113			channel_type = local->_oper_channel_type;
114		else
115			channel_type = NL80211_CHAN_NO_HT;
116	} else if (local->tmp_channel) {
117		chan = scan_chan = local->tmp_channel;
118		channel_type = local->tmp_channel_type;
119	} else {
120		chan = local->oper_channel;
121		channel_type = local->_oper_channel_type;
122	}
123
124	if (chan != local->oper_channel ||
125	    channel_type != local->_oper_channel_type)
126		return false;
127
128	/* Check current hardware-config against oper_channel. */
129	if ((local->oper_channel != local->hw.conf.channel) ||
130	    (local->_oper_channel_type != local->hw.conf.channel_type))
131		return false;
132
133	return true;
134}
135
136int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
137{
138	struct ieee80211_channel *chan, *scan_chan;
139	int ret = 0;
140	int power;
141	enum nl80211_channel_type channel_type;
142	u32 offchannel_flag;
143
144	might_sleep();
145
146	scan_chan = local->scan_channel;
147
148	/* If this off-channel logic ever changes,  ieee80211_on_oper_channel
149	 * may need to change as well.
150	 */
151	offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
152	if (scan_chan) {
153		chan = scan_chan;
154		/* If scanning on oper channel, use whatever channel-type
155		 * is currently in use.
156		 */
157		if (chan == local->oper_channel)
158			channel_type = local->_oper_channel_type;
159		else
160			channel_type = NL80211_CHAN_NO_HT;
161	} else if (local->tmp_channel) {
162		chan = scan_chan = local->tmp_channel;
163		channel_type = local->tmp_channel_type;
164	} else {
165		chan = local->oper_channel;
166		channel_type = local->_oper_channel_type;
167	}
168
169	if (chan != local->oper_channel ||
170	    channel_type != local->_oper_channel_type)
171		local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
172	else
173		local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
174
175	offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
176
177	if (offchannel_flag || chan != local->hw.conf.channel ||
178	    channel_type != local->hw.conf.channel_type) {
179		local->hw.conf.channel = chan;
180		local->hw.conf.channel_type = channel_type;
181		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
182	}
183
184	if (!conf_is_ht(&local->hw.conf)) {
185		/*
186		 * mac80211.h documents that this is only valid
187		 * when the channel is set to an HT type, and
188		 * that otherwise STATIC is used.
189		 */
190		local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
191	} else if (local->hw.conf.smps_mode != local->smps_mode) {
192		local->hw.conf.smps_mode = local->smps_mode;
193		changed |= IEEE80211_CONF_CHANGE_SMPS;
194	}
195
196	if ((local->scanning & SCAN_SW_SCANNING) ||
197	    (local->scanning & SCAN_HW_SCANNING))
198		power = chan->max_power;
199	else
200		power = local->power_constr_level ?
201			(chan->max_power - local->power_constr_level) :
202			chan->max_power;
203
204	if (local->user_power_level >= 0)
205		power = min(power, local->user_power_level);
206
207	if (local->hw.conf.power_level != power) {
208		changed |= IEEE80211_CONF_CHANGE_POWER;
209		local->hw.conf.power_level = power;
210	}
211
212	if (changed && local->open_count) {
213		ret = drv_config(local, changed);
214		/*
215		 * Goal:
216		 * HW reconfiguration should never fail, the driver has told
217		 * us what it can support so it should live up to that promise.
218		 *
219		 * Current status:
220		 * rfkill is not integrated with mac80211 and a
221		 * configuration command can thus fail if hardware rfkill
222		 * is enabled
223		 *
224		 * FIXME: integrate rfkill with mac80211 and then add this
225		 * WARN_ON() back
226		 *
227		 */
228		/* WARN_ON(ret); */
229	}
230
231	return ret;
232}
233
234void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
235				      u32 changed)
236{
237	struct ieee80211_local *local = sdata->local;
238	static const u8 zero[ETH_ALEN] = { 0 };
239
240	if (!changed)
241		return;
242
243	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
244		/*
245		 * While not associated, claim a BSSID of all-zeroes
246		 * so that drivers don't do any weird things with the
247		 * BSSID at that time.
248		 */
249		if (sdata->vif.bss_conf.assoc)
250			sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
251		else
252			sdata->vif.bss_conf.bssid = zero;
253	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
254		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
255	else if (sdata->vif.type == NL80211_IFTYPE_AP)
256		sdata->vif.bss_conf.bssid = sdata->vif.addr;
257	else if (sdata->vif.type == NL80211_IFTYPE_WDS)
258		sdata->vif.bss_conf.bssid = NULL;
259	else if (ieee80211_vif_is_mesh(&sdata->vif)) {
260		sdata->vif.bss_conf.bssid = zero;
261	} else {
262		WARN_ON(1);
263		return;
264	}
265
266	switch (sdata->vif.type) {
267	case NL80211_IFTYPE_AP:
268	case NL80211_IFTYPE_ADHOC:
269	case NL80211_IFTYPE_WDS:
270	case NL80211_IFTYPE_MESH_POINT:
271		break;
272	default:
273		/* do not warn to simplify caller in scan.c */
274		changed &= ~BSS_CHANGED_BEACON_ENABLED;
275		if (WARN_ON(changed & BSS_CHANGED_BEACON))
276			return;
277		break;
278	}
279
280	if (changed & BSS_CHANGED_BEACON_ENABLED) {
281		if (local->quiescing || !ieee80211_sdata_running(sdata) ||
282		    test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
283			sdata->vif.bss_conf.enable_beacon = false;
284		} else {
285			/*
286			 * Beacon should be enabled, but AP mode must
287			 * check whether there is a beacon configured.
288			 */
289			switch (sdata->vif.type) {
290			case NL80211_IFTYPE_AP:
291				sdata->vif.bss_conf.enable_beacon =
292					!!sdata->u.ap.beacon;
293				break;
294			case NL80211_IFTYPE_ADHOC:
295				sdata->vif.bss_conf.enable_beacon =
296					!!sdata->u.ibss.presp;
297				break;
298#ifdef CONFIG_MAC80211_MESH
299			case NL80211_IFTYPE_MESH_POINT:
300				sdata->vif.bss_conf.enable_beacon =
301					!!sdata->u.mesh.mesh_id_len;
302				break;
303#endif
304			default:
305				/* not reached */
306				WARN_ON(1);
307				break;
308			}
309		}
310	}
311
312	drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
313}
314
315u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
316{
317	sdata->vif.bss_conf.use_cts_prot = false;
318	sdata->vif.bss_conf.use_short_preamble = false;
319	sdata->vif.bss_conf.use_short_slot = false;
320	return BSS_CHANGED_ERP_CTS_PROT |
321	       BSS_CHANGED_ERP_PREAMBLE |
322	       BSS_CHANGED_ERP_SLOT;
323}
324
325static void ieee80211_tasklet_handler(unsigned long data)
326{
327	struct ieee80211_local *local = (struct ieee80211_local *) data;
328	struct sk_buff *skb;
329
330	while ((skb = skb_dequeue(&local->skb_queue)) ||
331	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
332		switch (skb->pkt_type) {
333		case IEEE80211_RX_MSG:
334			/* Clear skb->pkt_type in order to not confuse kernel
335			 * netstack. */
336			skb->pkt_type = 0;
337			ieee80211_rx(local_to_hw(local), skb);
338			break;
339		case IEEE80211_TX_STATUS_MSG:
340			skb->pkt_type = 0;
341			ieee80211_tx_status(local_to_hw(local), skb);
342			break;
343		default:
344			WARN(1, "mac80211: Packet is of unknown type %d\n",
345			     skb->pkt_type);
346			dev_kfree_skb(skb);
347			break;
348		}
349	}
350}
351
352static void ieee80211_restart_work(struct work_struct *work)
353{
354	struct ieee80211_local *local =
355		container_of(work, struct ieee80211_local, restart_work);
356
357	/* wait for scan work complete */
358	flush_workqueue(local->workqueue);
359
360	mutex_lock(&local->mtx);
361	WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
362	     local->sched_scanning,
363		"%s called with hardware scan in progress\n", __func__);
364	mutex_unlock(&local->mtx);
365
366	rtnl_lock();
367	ieee80211_scan_cancel(local);
368	ieee80211_reconfig(local);
369	rtnl_unlock();
370}
371
372void ieee80211_restart_hw(struct ieee80211_hw *hw)
373{
374	struct ieee80211_local *local = hw_to_local(hw);
375
376	trace_api_restart_hw(local);
377
378	wiphy_info(hw->wiphy,
379		   "Hardware restart was requested\n");
380
381	/* use this reason, ieee80211_reconfig will unblock it */
382	ieee80211_stop_queues_by_reason(hw,
383		IEEE80211_QUEUE_STOP_REASON_SUSPEND);
384
385	schedule_work(&local->restart_work);
386}
387EXPORT_SYMBOL(ieee80211_restart_hw);
388
389static void ieee80211_recalc_smps_work(struct work_struct *work)
390{
391	struct ieee80211_local *local =
392		container_of(work, struct ieee80211_local, recalc_smps);
393
394	mutex_lock(&local->iflist_mtx);
395	ieee80211_recalc_smps(local);
396	mutex_unlock(&local->iflist_mtx);
397}
398
399#ifdef CONFIG_INET
400static int ieee80211_ifa_changed(struct notifier_block *nb,
401				 unsigned long data, void *arg)
402{
403	struct in_ifaddr *ifa = arg;
404	struct ieee80211_local *local =
405		container_of(nb, struct ieee80211_local,
406			     ifa_notifier);
407	struct net_device *ndev = ifa->ifa_dev->dev;
408	struct wireless_dev *wdev = ndev->ieee80211_ptr;
409	struct in_device *idev;
410	struct ieee80211_sub_if_data *sdata;
411	struct ieee80211_bss_conf *bss_conf;
412	struct ieee80211_if_managed *ifmgd;
413	int c = 0;
414
415	/* Make sure it's our interface that got changed */
416	if (!wdev)
417		return NOTIFY_DONE;
418
419	if (wdev->wiphy != local->hw.wiphy)
420		return NOTIFY_DONE;
421
422	sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
423	bss_conf = &sdata->vif.bss_conf;
424
425	if (!ieee80211_sdata_running(sdata))
426		return NOTIFY_DONE;
427
428	/* ARP filtering is only supported in managed mode */
429	if (sdata->vif.type != NL80211_IFTYPE_STATION)
430		return NOTIFY_DONE;
431
432	idev = __in_dev_get_rtnl(sdata->dev);
433	if (!idev)
434		return NOTIFY_DONE;
435
436	ifmgd = &sdata->u.mgd;
437	mutex_lock(&ifmgd->mtx);
438
439	/* Copy the addresses to the bss_conf list */
440	ifa = idev->ifa_list;
441	while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
442		bss_conf->arp_addr_list[c] = ifa->ifa_address;
443		ifa = ifa->ifa_next;
444		c++;
445	}
446
447	/* If not all addresses fit the list, disable filtering */
448	if (ifa) {
449		sdata->arp_filter_state = false;
450		c = 0;
451	} else {
452		sdata->arp_filter_state = true;
453	}
454	bss_conf->arp_addr_cnt = c;
455
456	/* Configure driver only if associated */
457	if (ifmgd->associated) {
458		bss_conf->arp_filter_enabled = sdata->arp_filter_state;
459		ieee80211_bss_info_change_notify(sdata,
460						 BSS_CHANGED_ARP_FILTER);
461	}
462
463	mutex_unlock(&ifmgd->mtx);
464
465	return NOTIFY_DONE;
466}
467#endif
468
469static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
470{
471	struct ieee80211_local *local =
472		container_of(napi, struct ieee80211_local, napi);
473
474	return local->ops->napi_poll(&local->hw, budget);
475}
476
477void ieee80211_napi_schedule(struct ieee80211_hw *hw)
478{
479	struct ieee80211_local *local = hw_to_local(hw);
480
481	napi_schedule(&local->napi);
482}
483EXPORT_SYMBOL(ieee80211_napi_schedule);
484
485void ieee80211_napi_complete(struct ieee80211_hw *hw)
486{
487	struct ieee80211_local *local = hw_to_local(hw);
488
489	napi_complete(&local->napi);
490}
491EXPORT_SYMBOL(ieee80211_napi_complete);
492
493/* There isn't a lot of sense in it, but you can transmit anything you like */
494static const struct ieee80211_txrx_stypes
495ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
496	[NL80211_IFTYPE_ADHOC] = {
497		.tx = 0xffff,
498		.rx = BIT(IEEE80211_STYPE_ACTION >> 4),
499	},
500	[NL80211_IFTYPE_STATION] = {
501		.tx = 0xffff,
502		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
503			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
504	},
505	[NL80211_IFTYPE_AP] = {
506		.tx = 0xffff,
507		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
508			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
509			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
510			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
511			BIT(IEEE80211_STYPE_AUTH >> 4) |
512			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
513			BIT(IEEE80211_STYPE_ACTION >> 4),
514	},
515	[NL80211_IFTYPE_AP_VLAN] = {
516		/* copy AP */
517		.tx = 0xffff,
518		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
519			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
520			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
521			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
522			BIT(IEEE80211_STYPE_AUTH >> 4) |
523			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
524			BIT(IEEE80211_STYPE_ACTION >> 4),
525	},
526	[NL80211_IFTYPE_P2P_CLIENT] = {
527		.tx = 0xffff,
528		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
529			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
530	},
531	[NL80211_IFTYPE_P2P_GO] = {
532		.tx = 0xffff,
533		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
534			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
535			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
536			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
537			BIT(IEEE80211_STYPE_AUTH >> 4) |
538			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
539			BIT(IEEE80211_STYPE_ACTION >> 4),
540	},
541	[NL80211_IFTYPE_MESH_POINT] = {
542		.tx = 0xffff,
543		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
544			BIT(IEEE80211_STYPE_AUTH >> 4) |
545			BIT(IEEE80211_STYPE_DEAUTH >> 4),
546	},
547};
548
549struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
550					const struct ieee80211_ops *ops)
551{
552	struct ieee80211_local *local;
553	int priv_size, i;
554	struct wiphy *wiphy;
555
556	/* Ensure 32-byte alignment of our private data and hw private data.
557	 * We use the wiphy priv data for both our ieee80211_local and for
558	 * the driver's private data
559	 *
560	 * In memory it'll be like this:
561	 *
562	 * +-------------------------+
563	 * | struct wiphy	    |
564	 * +-------------------------+
565	 * | struct ieee80211_local  |
566	 * +-------------------------+
567	 * | driver's private data   |
568	 * +-------------------------+
569	 *
570	 */
571	priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
572
573	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
574
575	if (!wiphy)
576		return NULL;
577
578	wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
579
580	wiphy->privid = mac80211_wiphy_privid;
581
582	wiphy->flags |= WIPHY_FLAG_NETNS_OK |
583			WIPHY_FLAG_4ADDR_AP |
584			WIPHY_FLAG_4ADDR_STATION;
585
586	if (!ops->set_key)
587		wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
588
589	wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
590
591	local = wiphy_priv(wiphy);
592
593	local->hw.wiphy = wiphy;
594
595	local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
596
597	BUG_ON(!ops->tx);
598	BUG_ON(!ops->start);
599	BUG_ON(!ops->stop);
600	BUG_ON(!ops->config);
601	BUG_ON(!ops->add_interface);
602	BUG_ON(!ops->remove_interface);
603	BUG_ON(!ops->configure_filter);
604	local->ops = ops;
605
606	/* set up some defaults */
607	local->hw.queues = 1;
608	local->hw.max_rates = 1;
609	local->hw.max_report_rates = 0;
610	local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
611	local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
612	local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
613	local->user_power_level = -1;
614	local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
615	local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
616
617	INIT_LIST_HEAD(&local->interfaces);
618
619	__hw_addr_init(&local->mc_list);
620
621	mutex_init(&local->iflist_mtx);
622	mutex_init(&local->mtx);
623
624	mutex_init(&local->key_mtx);
625	spin_lock_init(&local->filter_lock);
626	spin_lock_init(&local->queue_stop_reason_lock);
627
628	/*
629	 * The rx_skb_queue is only accessed from tasklets,
630	 * but other SKB queues are used from within IRQ
631	 * context. Therefore, this one needs a different
632	 * locking class so our direct, non-irq-safe use of
633	 * the queue's lock doesn't throw lockdep warnings.
634	 */
635	skb_queue_head_init_class(&local->rx_skb_queue,
636				  &ieee80211_rx_skb_queue_class);
637
638	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
639
640	ieee80211_work_init(local);
641
642	INIT_WORK(&local->restart_work, ieee80211_restart_work);
643
644	INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
645	INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
646	local->smps_mode = IEEE80211_SMPS_OFF;
647
648	INIT_WORK(&local->dynamic_ps_enable_work,
649		  ieee80211_dynamic_ps_enable_work);
650	INIT_WORK(&local->dynamic_ps_disable_work,
651		  ieee80211_dynamic_ps_disable_work);
652	setup_timer(&local->dynamic_ps_timer,
653		    ieee80211_dynamic_ps_timer, (unsigned long) local);
654
655	INIT_WORK(&local->sched_scan_stopped_work,
656		  ieee80211_sched_scan_stopped_work);
657
658	sta_info_init(local);
659
660	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
661		skb_queue_head_init(&local->pending[i]);
662		atomic_set(&local->agg_queue_stop[i], 0);
663	}
664	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
665		     (unsigned long)local);
666
667	tasklet_init(&local->tasklet,
668		     ieee80211_tasklet_handler,
669		     (unsigned long) local);
670
671	skb_queue_head_init(&local->skb_queue);
672	skb_queue_head_init(&local->skb_queue_unreliable);
673
674	/* init dummy netdev for use w/ NAPI */
675	init_dummy_netdev(&local->napi_dev);
676
677	ieee80211_led_names(local);
678
679	ieee80211_hw_roc_setup(local);
680
681	return local_to_hw(local);
682}
683EXPORT_SYMBOL(ieee80211_alloc_hw);
684
685int ieee80211_register_hw(struct ieee80211_hw *hw)
686{
687	struct ieee80211_local *local = hw_to_local(hw);
688	int result, i;
689	enum ieee80211_band band;
690	int channels, max_bitrates;
691	bool supp_ht;
692	static const u32 cipher_suites[] = {
693		/* keep WEP first, it may be removed below */
694		WLAN_CIPHER_SUITE_WEP40,
695		WLAN_CIPHER_SUITE_WEP104,
696		WLAN_CIPHER_SUITE_TKIP,
697		WLAN_CIPHER_SUITE_CCMP,
698
699		/* keep last -- depends on hw flags! */
700		WLAN_CIPHER_SUITE_AES_CMAC
701	};
702
703	if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
704#ifdef CONFIG_PM
705	    && (!local->ops->suspend || !local->ops->resume)
706#endif
707	    )
708		return -EINVAL;
709
710	if (hw->max_report_rates == 0)
711		hw->max_report_rates = hw->max_rates;
712
713	/*
714	 * generic code guarantees at least one band,
715	 * set this very early because much code assumes
716	 * that hw.conf.channel is assigned
717	 */
718	channels = 0;
719	max_bitrates = 0;
720	supp_ht = false;
721	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
722		struct ieee80211_supported_band *sband;
723
724		sband = local->hw.wiphy->bands[band];
725		if (!sband)
726			continue;
727		if (!local->oper_channel) {
728			/* init channel we're on */
729			local->hw.conf.channel =
730			local->oper_channel = &sband->channels[0];
731			local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
732		}
733		channels += sband->n_channels;
734
735		if (max_bitrates < sband->n_bitrates)
736			max_bitrates = sband->n_bitrates;
737		supp_ht = supp_ht || sband->ht_cap.ht_supported;
738	}
739
740	local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
741				      sizeof(void *) * channels, GFP_KERNEL);
742	if (!local->int_scan_req)
743		return -ENOMEM;
744
745	/* if low-level driver supports AP, we also support VLAN */
746	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
747		hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
748		hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
749	}
750
751	/* mac80211 always supports monitor */
752	hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
753	hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
754
755	/*
756	 * mac80211 doesn't support more than 1 channel, and also not more
757	 * than one IBSS interface
758	 */
759	for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
760		const struct ieee80211_iface_combination *c;
761		int j;
762
763		c = &hw->wiphy->iface_combinations[i];
764
765		if (c->num_different_channels > 1)
766			return -EINVAL;
767
768		for (j = 0; j < c->n_limits; j++)
769			if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
770			    c->limits[j].max > 1)
771				return -EINVAL;
772	}
773
774#ifndef CONFIG_MAC80211_MESH
775	/* mesh depends on Kconfig, but drivers should set it if they want */
776	local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
777#endif
778
779	/* if the underlying driver supports mesh, mac80211 will (at least)
780	 * provide routing of mesh authentication frames to userspace */
781	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
782		local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
783
784	/* mac80211 supports control port protocol changing */
785	local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
786
787	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
788		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
789	else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
790		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
791
792	WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
793	     && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
794	     "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
795
796	/*
797	 * Calculate scan IE length -- we need this to alloc
798	 * memory and to subtract from the driver limit. It
799	 * includes the DS Params, (extended) supported rates, and HT
800	 * information -- SSID is the driver's responsibility.
801	 */
802	local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
803		3 /* DS Params */;
804	if (supp_ht)
805		local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
806
807	if (!local->ops->hw_scan) {
808		/* For hw_scan, driver needs to set these up. */
809		local->hw.wiphy->max_scan_ssids = 4;
810		local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
811	}
812
813	/*
814	 * If the driver supports any scan IEs, then assume the
815	 * limit includes the IEs mac80211 will add, otherwise
816	 * leave it at zero and let the driver sort it out; we
817	 * still pass our IEs to the driver but userspace will
818	 * not be allowed to in that case.
819	 */
820	if (local->hw.wiphy->max_scan_ie_len)
821		local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
822
823	/* Set up cipher suites unless driver already did */
824	if (!local->hw.wiphy->cipher_suites) {
825		local->hw.wiphy->cipher_suites = cipher_suites;
826		local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
827		if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
828			local->hw.wiphy->n_cipher_suites--;
829	}
830	if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
831		if (local->hw.wiphy->cipher_suites == cipher_suites) {
832			local->hw.wiphy->cipher_suites += 2;
833			local->hw.wiphy->n_cipher_suites -= 2;
834		} else {
835			u32 *suites;
836			int r, w = 0;
837
838			/* Filter out WEP */
839
840			suites = kmemdup(
841				local->hw.wiphy->cipher_suites,
842				sizeof(u32) * local->hw.wiphy->n_cipher_suites,
843				GFP_KERNEL);
844			if (!suites)
845				return -ENOMEM;
846			for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
847				u32 suite = local->hw.wiphy->cipher_suites[r];
848				if (suite == WLAN_CIPHER_SUITE_WEP40 ||
849				    suite == WLAN_CIPHER_SUITE_WEP104)
850					continue;
851				suites[w++] = suite;
852			}
853			local->hw.wiphy->cipher_suites = suites;
854			local->hw.wiphy->n_cipher_suites = w;
855			local->wiphy_ciphers_allocated = true;
856		}
857	}
858
859	if (!local->ops->remain_on_channel)
860		local->hw.wiphy->max_remain_on_channel_duration = 5000;
861
862	if (local->ops->sched_scan_start)
863		local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
864
865	result = wiphy_register(local->hw.wiphy);
866	if (result < 0)
867		goto fail_wiphy_register;
868
869	/*
870	 * We use the number of queues for feature tests (QoS, HT) internally
871	 * so restrict them appropriately.
872	 */
873	if (hw->queues > IEEE80211_MAX_QUEUES)
874		hw->queues = IEEE80211_MAX_QUEUES;
875
876	local->workqueue =
877		alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
878	if (!local->workqueue) {
879		result = -ENOMEM;
880		goto fail_workqueue;
881	}
882
883	/*
884	 * The hardware needs headroom for sending the frame,
885	 * and we need some headroom for passing the frame to monitor
886	 * interfaces, but never both at the same time.
887	 */
888#ifndef __CHECKER__
889	BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
890			sizeof(struct ieee80211_tx_status_rtap_hdr));
891#endif
892	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
893				   sizeof(struct ieee80211_tx_status_rtap_hdr));
894
895	debugfs_hw_add(local);
896
897	/*
898	 * if the driver doesn't specify a max listen interval we
899	 * use 5 which should be a safe default
900	 */
901	if (local->hw.max_listen_interval == 0)
902		local->hw.max_listen_interval = 5;
903
904	local->hw.conf.listen_interval = local->hw.max_listen_interval;
905
906	local->dynamic_ps_forced_timeout = -1;
907
908	result = ieee80211_wep_init(local);
909	if (result < 0)
910		wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
911			    result);
912
913	rtnl_lock();
914
915	result = ieee80211_init_rate_ctrl_alg(local,
916					      hw->rate_control_algorithm);
917	if (result < 0) {
918		wiphy_debug(local->hw.wiphy,
919			    "Failed to initialize rate control algorithm\n");
920		goto fail_rate;
921	}
922
923	/* add one default STA interface if supported */
924	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
925		result = ieee80211_if_add(local, "wlan%d", NULL,
926					  NL80211_IFTYPE_STATION, NULL);
927		if (result)
928			wiphy_warn(local->hw.wiphy,
929				   "Failed to add default virtual iface\n");
930	}
931
932	rtnl_unlock();
933
934	ieee80211_led_init(local);
935
936	local->network_latency_notifier.notifier_call =
937		ieee80211_max_network_latency;
938	result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
939				     &local->network_latency_notifier);
940	if (result) {
941		rtnl_lock();
942		goto fail_pm_qos;
943	}
944
945#ifdef CONFIG_INET
946	local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
947	result = register_inetaddr_notifier(&local->ifa_notifier);
948	if (result)
949		goto fail_ifa;
950#endif
951
952	netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
953			local->hw.napi_weight);
954
955	return 0;
956
957#ifdef CONFIG_INET
958 fail_ifa:
959	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
960			       &local->network_latency_notifier);
961	rtnl_lock();
962#endif
963 fail_pm_qos:
964	ieee80211_led_exit(local);
965	ieee80211_remove_interfaces(local);
966 fail_rate:
967	rtnl_unlock();
968	ieee80211_wep_free(local);
969	sta_info_stop(local);
970	destroy_workqueue(local->workqueue);
971 fail_workqueue:
972	wiphy_unregister(local->hw.wiphy);
973 fail_wiphy_register:
974	if (local->wiphy_ciphers_allocated)
975		kfree(local->hw.wiphy->cipher_suites);
976	kfree(local->int_scan_req);
977	return result;
978}
979EXPORT_SYMBOL(ieee80211_register_hw);
980
981void ieee80211_unregister_hw(struct ieee80211_hw *hw)
982{
983	struct ieee80211_local *local = hw_to_local(hw);
984
985	tasklet_kill(&local->tx_pending_tasklet);
986	tasklet_kill(&local->tasklet);
987
988	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
989			       &local->network_latency_notifier);
990#ifdef CONFIG_INET
991	unregister_inetaddr_notifier(&local->ifa_notifier);
992#endif
993
994	rtnl_lock();
995
996	/*
997	 * At this point, interface list manipulations are fine
998	 * because the driver cannot be handing us frames any
999	 * more and the tasklet is killed.
1000	 */
1001	ieee80211_remove_interfaces(local);
1002
1003	rtnl_unlock();
1004
1005	/*
1006	 * Now all work items will be gone, but the
1007	 * timer might still be armed, so delete it
1008	 */
1009	del_timer_sync(&local->work_timer);
1010
1011	cancel_work_sync(&local->restart_work);
1012	cancel_work_sync(&local->reconfig_filter);
1013
1014	ieee80211_clear_tx_pending(local);
1015	sta_info_stop(local);
1016	rate_control_deinitialize(local);
1017
1018	if (skb_queue_len(&local->skb_queue) ||
1019	    skb_queue_len(&local->skb_queue_unreliable))
1020		wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1021	skb_queue_purge(&local->skb_queue);
1022	skb_queue_purge(&local->skb_queue_unreliable);
1023	skb_queue_purge(&local->rx_skb_queue);
1024
1025	destroy_workqueue(local->workqueue);
1026	wiphy_unregister(local->hw.wiphy);
1027	ieee80211_wep_free(local);
1028	ieee80211_led_exit(local);
1029	kfree(local->int_scan_req);
1030}
1031EXPORT_SYMBOL(ieee80211_unregister_hw);
1032
1033void ieee80211_free_hw(struct ieee80211_hw *hw)
1034{
1035	struct ieee80211_local *local = hw_to_local(hw);
1036
1037	mutex_destroy(&local->iflist_mtx);
1038	mutex_destroy(&local->mtx);
1039
1040	if (local->wiphy_ciphers_allocated)
1041		kfree(local->hw.wiphy->cipher_suites);
1042
1043	wiphy_free(local->hw.wiphy);
1044}
1045EXPORT_SYMBOL(ieee80211_free_hw);
1046
1047static int __init ieee80211_init(void)
1048{
1049	struct sk_buff *skb;
1050	int ret;
1051
1052	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1053	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1054		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1055
1056	ret = rc80211_minstrel_init();
1057	if (ret)
1058		return ret;
1059
1060	ret = rc80211_minstrel_ht_init();
1061	if (ret)
1062		goto err_minstrel;
1063
1064	ret = rc80211_pid_init();
1065	if (ret)
1066		goto err_pid;
1067
1068	ret = ieee80211_iface_init();
1069	if (ret)
1070		goto err_netdev;
1071
1072	return 0;
1073 err_netdev:
1074	rc80211_pid_exit();
1075 err_pid:
1076	rc80211_minstrel_ht_exit();
1077 err_minstrel:
1078	rc80211_minstrel_exit();
1079
1080	return ret;
1081}
1082
1083static void __exit ieee80211_exit(void)
1084{
1085	rc80211_pid_exit();
1086	rc80211_minstrel_ht_exit();
1087	rc80211_minstrel_exit();
1088
1089	if (mesh_allocated)
1090		ieee80211s_stop();
1091
1092	ieee80211_iface_exit();
1093
1094	rcu_barrier();
1095}
1096
1097
1098subsys_initcall(ieee80211_init);
1099module_exit(ieee80211_exit);
1100
1101MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1102MODULE_LICENSE("GPL");
1103