main.c revision ee971924543fe82f279d3e97f6f6d02320b381b7 
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;
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 = 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;
139	int ret = 0;
140	int power;
141	enum nl80211_channel_type channel_type;
142	u32 offchannel_flag;
143
144	might_sleep();
145
146	/* If this off-channel logic ever changes,  ieee80211_on_oper_channel
147	 * may need to change as well.
148	 */
149	offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
150	if (local->scan_channel) {
151		chan = local->scan_channel;
152		/* If scanning on oper channel, use whatever channel-type
153		 * is currently in use.
154		 */
155		if (chan == local->oper_channel)
156			channel_type = local->_oper_channel_type;
157		else
158			channel_type = NL80211_CHAN_NO_HT;
159	} else if (local->tmp_channel) {
160		chan = local->tmp_channel;
161		channel_type = local->tmp_channel_type;
162	} else {
163		chan = local->oper_channel;
164		channel_type = local->_oper_channel_type;
165	}
166
167	if (chan != local->oper_channel ||
168	    channel_type != local->_oper_channel_type)
169		local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
170	else
171		local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
172
173	offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
174
175	if (offchannel_flag || chan != local->hw.conf.channel ||
176	    channel_type != local->hw.conf.channel_type) {
177		local->hw.conf.channel = chan;
178		local->hw.conf.channel_type = channel_type;
179		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
180	}
181
182	if (!conf_is_ht(&local->hw.conf)) {
183		/*
184		 * mac80211.h documents that this is only valid
185		 * when the channel is set to an HT type, and
186		 * that otherwise STATIC is used.
187		 */
188		local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
189	} else if (local->hw.conf.smps_mode != local->smps_mode) {
190		local->hw.conf.smps_mode = local->smps_mode;
191		changed |= IEEE80211_CONF_CHANGE_SMPS;
192	}
193
194	if ((local->scanning & SCAN_SW_SCANNING) ||
195	    (local->scanning & SCAN_HW_SCANNING))
196		power = chan->max_power;
197	else
198		power = local->power_constr_level ?
199			(chan->max_power - local->power_constr_level) :
200			chan->max_power;
201
202	if (local->user_power_level >= 0)
203		power = min(power, local->user_power_level);
204
205	if (local->hw.conf.power_level != power) {
206		changed |= IEEE80211_CONF_CHANGE_POWER;
207		local->hw.conf.power_level = power;
208	}
209
210	if (changed && local->open_count) {
211		ret = drv_config(local, changed);
212		/*
213		 * Goal:
214		 * HW reconfiguration should never fail, the driver has told
215		 * us what it can support so it should live up to that promise.
216		 *
217		 * Current status:
218		 * rfkill is not integrated with mac80211 and a
219		 * configuration command can thus fail if hardware rfkill
220		 * is enabled
221		 *
222		 * FIXME: integrate rfkill with mac80211 and then add this
223		 * WARN_ON() back
224		 *
225		 */
226		/* WARN_ON(ret); */
227	}
228
229	return ret;
230}
231
232void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
233				      u32 changed)
234{
235	struct ieee80211_local *local = sdata->local;
236	static const u8 zero[ETH_ALEN] = { 0 };
237
238	if (!changed)
239		return;
240
241	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
242		/*
243		 * While not associated, claim a BSSID of all-zeroes
244		 * so that drivers don't do any weird things with the
245		 * BSSID at that time.
246		 */
247		if (sdata->vif.bss_conf.assoc)
248			sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
249		else
250			sdata->vif.bss_conf.bssid = zero;
251	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
252		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
253	else if (sdata->vif.type == NL80211_IFTYPE_AP)
254		sdata->vif.bss_conf.bssid = sdata->vif.addr;
255	else if (sdata->vif.type == NL80211_IFTYPE_WDS)
256		sdata->vif.bss_conf.bssid = NULL;
257	else if (ieee80211_vif_is_mesh(&sdata->vif)) {
258		sdata->vif.bss_conf.bssid = zero;
259	} else {
260		WARN_ON(1);
261		return;
262	}
263
264	switch (sdata->vif.type) {
265	case NL80211_IFTYPE_AP:
266	case NL80211_IFTYPE_ADHOC:
267	case NL80211_IFTYPE_WDS:
268	case NL80211_IFTYPE_MESH_POINT:
269		break;
270	default:
271		/* do not warn to simplify caller in scan.c */
272		changed &= ~BSS_CHANGED_BEACON_ENABLED;
273		if (WARN_ON(changed & BSS_CHANGED_BEACON))
274			return;
275		break;
276	}
277
278	if (changed & BSS_CHANGED_BEACON_ENABLED) {
279		if (local->quiescing || !ieee80211_sdata_running(sdata) ||
280		    test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
281			sdata->vif.bss_conf.enable_beacon = false;
282		} else {
283			/*
284			 * Beacon should be enabled, but AP mode must
285			 * check whether there is a beacon configured.
286			 */
287			switch (sdata->vif.type) {
288			case NL80211_IFTYPE_AP:
289				sdata->vif.bss_conf.enable_beacon =
290					!!sdata->u.ap.beacon;
291				break;
292			case NL80211_IFTYPE_ADHOC:
293				sdata->vif.bss_conf.enable_beacon =
294					!!sdata->u.ibss.presp;
295				break;
296#ifdef CONFIG_MAC80211_MESH
297			case NL80211_IFTYPE_MESH_POINT:
298				sdata->vif.bss_conf.enable_beacon =
299					!!sdata->u.mesh.mesh_id_len;
300				break;
301#endif
302			default:
303				/* not reached */
304				WARN_ON(1);
305				break;
306			}
307		}
308	}
309
310	drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
311}
312
313u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
314{
315	sdata->vif.bss_conf.use_cts_prot = false;
316	sdata->vif.bss_conf.use_short_preamble = false;
317	sdata->vif.bss_conf.use_short_slot = false;
318	return BSS_CHANGED_ERP_CTS_PROT |
319	       BSS_CHANGED_ERP_PREAMBLE |
320	       BSS_CHANGED_ERP_SLOT;
321}
322
323static void ieee80211_tasklet_handler(unsigned long data)
324{
325	struct ieee80211_local *local = (struct ieee80211_local *) data;
326	struct sta_info *sta, *tmp;
327	struct skb_eosp_msg_data *eosp_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		case IEEE80211_EOSP_MSG:
344			eosp_data = (void *)skb->cb;
345			for_each_sta_info(local, eosp_data->sta, sta, tmp) {
346				/* skip wrong virtual interface */
347				if (memcmp(eosp_data->iface,
348					   sta->sdata->vif.addr, ETH_ALEN))
349					continue;
350				clear_sta_flag(sta, WLAN_STA_SP);
351				break;
352			}
353			dev_kfree_skb(skb);
354			break;
355		default:
356			WARN(1, "mac80211: Packet is of unknown type %d\n",
357			     skb->pkt_type);
358			dev_kfree_skb(skb);
359			break;
360		}
361	}
362}
363
364static void ieee80211_restart_work(struct work_struct *work)
365{
366	struct ieee80211_local *local =
367		container_of(work, struct ieee80211_local, restart_work);
368
369	/* wait for scan work complete */
370	flush_workqueue(local->workqueue);
371
372	mutex_lock(&local->mtx);
373	WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
374	     local->sched_scanning,
375		"%s called with hardware scan in progress\n", __func__);
376	mutex_unlock(&local->mtx);
377
378	rtnl_lock();
379	ieee80211_scan_cancel(local);
380	ieee80211_reconfig(local);
381	rtnl_unlock();
382}
383
384void ieee80211_restart_hw(struct ieee80211_hw *hw)
385{
386	struct ieee80211_local *local = hw_to_local(hw);
387
388	trace_api_restart_hw(local);
389
390	wiphy_info(hw->wiphy,
391		   "Hardware restart was requested\n");
392
393	/* use this reason, ieee80211_reconfig will unblock it */
394	ieee80211_stop_queues_by_reason(hw,
395		IEEE80211_QUEUE_STOP_REASON_SUSPEND);
396
397	schedule_work(&local->restart_work);
398}
399EXPORT_SYMBOL(ieee80211_restart_hw);
400
401static void ieee80211_recalc_smps_work(struct work_struct *work)
402{
403	struct ieee80211_local *local =
404		container_of(work, struct ieee80211_local, recalc_smps);
405
406	mutex_lock(&local->iflist_mtx);
407	ieee80211_recalc_smps(local);
408	mutex_unlock(&local->iflist_mtx);
409}
410
411#ifdef CONFIG_INET
412static int ieee80211_ifa_changed(struct notifier_block *nb,
413				 unsigned long data, void *arg)
414{
415	struct in_ifaddr *ifa = arg;
416	struct ieee80211_local *local =
417		container_of(nb, struct ieee80211_local,
418			     ifa_notifier);
419	struct net_device *ndev = ifa->ifa_dev->dev;
420	struct wireless_dev *wdev = ndev->ieee80211_ptr;
421	struct in_device *idev;
422	struct ieee80211_sub_if_data *sdata;
423	struct ieee80211_bss_conf *bss_conf;
424	struct ieee80211_if_managed *ifmgd;
425	int c = 0;
426
427	/* Make sure it's our interface that got changed */
428	if (!wdev)
429		return NOTIFY_DONE;
430
431	if (wdev->wiphy != local->hw.wiphy)
432		return NOTIFY_DONE;
433
434	sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
435	bss_conf = &sdata->vif.bss_conf;
436
437	if (!ieee80211_sdata_running(sdata))
438		return NOTIFY_DONE;
439
440	/* ARP filtering is only supported in managed mode */
441	if (sdata->vif.type != NL80211_IFTYPE_STATION)
442		return NOTIFY_DONE;
443
444	idev = __in_dev_get_rtnl(sdata->dev);
445	if (!idev)
446		return NOTIFY_DONE;
447
448	ifmgd = &sdata->u.mgd;
449	mutex_lock(&ifmgd->mtx);
450
451	/* Copy the addresses to the bss_conf list */
452	ifa = idev->ifa_list;
453	while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
454		bss_conf->arp_addr_list[c] = ifa->ifa_address;
455		ifa = ifa->ifa_next;
456		c++;
457	}
458
459	/* If not all addresses fit the list, disable filtering */
460	if (ifa) {
461		sdata->arp_filter_state = false;
462		c = 0;
463	} else {
464		sdata->arp_filter_state = true;
465	}
466	bss_conf->arp_addr_cnt = c;
467
468	/* Configure driver only if associated */
469	if (ifmgd->associated) {
470		bss_conf->arp_filter_enabled = sdata->arp_filter_state;
471		ieee80211_bss_info_change_notify(sdata,
472						 BSS_CHANGED_ARP_FILTER);
473	}
474
475	mutex_unlock(&ifmgd->mtx);
476
477	return NOTIFY_DONE;
478}
479#endif
480
481static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
482{
483	struct ieee80211_local *local =
484		container_of(napi, struct ieee80211_local, napi);
485
486	return local->ops->napi_poll(&local->hw, budget);
487}
488
489void ieee80211_napi_schedule(struct ieee80211_hw *hw)
490{
491	struct ieee80211_local *local = hw_to_local(hw);
492
493	napi_schedule(&local->napi);
494}
495EXPORT_SYMBOL(ieee80211_napi_schedule);
496
497void ieee80211_napi_complete(struct ieee80211_hw *hw)
498{
499	struct ieee80211_local *local = hw_to_local(hw);
500
501	napi_complete(&local->napi);
502}
503EXPORT_SYMBOL(ieee80211_napi_complete);
504
505/* There isn't a lot of sense in it, but you can transmit anything you like */
506static const struct ieee80211_txrx_stypes
507ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
508	[NL80211_IFTYPE_ADHOC] = {
509		.tx = 0xffff,
510		.rx = BIT(IEEE80211_STYPE_ACTION >> 4),
511	},
512	[NL80211_IFTYPE_STATION] = {
513		.tx = 0xffff,
514		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
515			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
516	},
517	[NL80211_IFTYPE_AP] = {
518		.tx = 0xffff,
519		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
520			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
521			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
522			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
523			BIT(IEEE80211_STYPE_AUTH >> 4) |
524			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
525			BIT(IEEE80211_STYPE_ACTION >> 4),
526	},
527	[NL80211_IFTYPE_AP_VLAN] = {
528		/* copy AP */
529		.tx = 0xffff,
530		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
531			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
532			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
533			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
534			BIT(IEEE80211_STYPE_AUTH >> 4) |
535			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
536			BIT(IEEE80211_STYPE_ACTION >> 4),
537	},
538	[NL80211_IFTYPE_P2P_CLIENT] = {
539		.tx = 0xffff,
540		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
541			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
542	},
543	[NL80211_IFTYPE_P2P_GO] = {
544		.tx = 0xffff,
545		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
546			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
547			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
548			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
549			BIT(IEEE80211_STYPE_AUTH >> 4) |
550			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
551			BIT(IEEE80211_STYPE_ACTION >> 4),
552	},
553	[NL80211_IFTYPE_MESH_POINT] = {
554		.tx = 0xffff,
555		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
556			BIT(IEEE80211_STYPE_AUTH >> 4) |
557			BIT(IEEE80211_STYPE_DEAUTH >> 4),
558	},
559};
560
561struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
562					const struct ieee80211_ops *ops)
563{
564	struct ieee80211_local *local;
565	int priv_size, i;
566	struct wiphy *wiphy;
567
568	/* Ensure 32-byte alignment of our private data and hw private data.
569	 * We use the wiphy priv data for both our ieee80211_local and for
570	 * the driver's private data
571	 *
572	 * In memory it'll be like this:
573	 *
574	 * +-------------------------+
575	 * | struct wiphy	    |
576	 * +-------------------------+
577	 * | struct ieee80211_local  |
578	 * +-------------------------+
579	 * | driver's private data   |
580	 * +-------------------------+
581	 *
582	 */
583	priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
584
585	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
586
587	if (!wiphy)
588		return NULL;
589
590	wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
591
592	wiphy->privid = mac80211_wiphy_privid;
593
594	wiphy->flags |= WIPHY_FLAG_NETNS_OK |
595			WIPHY_FLAG_4ADDR_AP |
596			WIPHY_FLAG_4ADDR_STATION |
597			WIPHY_FLAG_REPORTS_OBSS;
598
599	if (!ops->set_key)
600		wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
601
602	wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
603
604	local = wiphy_priv(wiphy);
605
606	local->hw.wiphy = wiphy;
607
608	local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
609
610	BUG_ON(!ops->tx);
611	BUG_ON(!ops->start);
612	BUG_ON(!ops->stop);
613	BUG_ON(!ops->config);
614	BUG_ON(!ops->add_interface);
615	BUG_ON(!ops->remove_interface);
616	BUG_ON(!ops->configure_filter);
617	local->ops = ops;
618
619	/* set up some defaults */
620	local->hw.queues = 1;
621	local->hw.max_rates = 1;
622	local->hw.max_report_rates = 0;
623	local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
624	local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
625	local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
626	local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
627	local->user_power_level = -1;
628	local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
629	local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
630
631	INIT_LIST_HEAD(&local->interfaces);
632
633	__hw_addr_init(&local->mc_list);
634
635	mutex_init(&local->iflist_mtx);
636	mutex_init(&local->mtx);
637
638	mutex_init(&local->key_mtx);
639	spin_lock_init(&local->filter_lock);
640	spin_lock_init(&local->queue_stop_reason_lock);
641
642	/*
643	 * The rx_skb_queue is only accessed from tasklets,
644	 * but other SKB queues are used from within IRQ
645	 * context. Therefore, this one needs a different
646	 * locking class so our direct, non-irq-safe use of
647	 * the queue's lock doesn't throw lockdep warnings.
648	 */
649	skb_queue_head_init_class(&local->rx_skb_queue,
650				  &ieee80211_rx_skb_queue_class);
651
652	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
653
654	ieee80211_work_init(local);
655
656	INIT_WORK(&local->restart_work, ieee80211_restart_work);
657
658	INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
659	INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
660	local->smps_mode = IEEE80211_SMPS_OFF;
661
662	INIT_WORK(&local->dynamic_ps_enable_work,
663		  ieee80211_dynamic_ps_enable_work);
664	INIT_WORK(&local->dynamic_ps_disable_work,
665		  ieee80211_dynamic_ps_disable_work);
666	setup_timer(&local->dynamic_ps_timer,
667		    ieee80211_dynamic_ps_timer, (unsigned long) local);
668
669	INIT_WORK(&local->sched_scan_stopped_work,
670		  ieee80211_sched_scan_stopped_work);
671
672	sta_info_init(local);
673
674	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
675		skb_queue_head_init(&local->pending[i]);
676		atomic_set(&local->agg_queue_stop[i], 0);
677	}
678	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
679		     (unsigned long)local);
680
681	tasklet_init(&local->tasklet,
682		     ieee80211_tasklet_handler,
683		     (unsigned long) local);
684
685	skb_queue_head_init(&local->skb_queue);
686	skb_queue_head_init(&local->skb_queue_unreliable);
687
688	/* init dummy netdev for use w/ NAPI */
689	init_dummy_netdev(&local->napi_dev);
690
691	ieee80211_led_names(local);
692
693	ieee80211_hw_roc_setup(local);
694
695	return local_to_hw(local);
696}
697EXPORT_SYMBOL(ieee80211_alloc_hw);
698
699int ieee80211_register_hw(struct ieee80211_hw *hw)
700{
701	struct ieee80211_local *local = hw_to_local(hw);
702	int result, i;
703	enum ieee80211_band band;
704	int channels, max_bitrates;
705	bool supp_ht;
706	static const u32 cipher_suites[] = {
707		/* keep WEP first, it may be removed below */
708		WLAN_CIPHER_SUITE_WEP40,
709		WLAN_CIPHER_SUITE_WEP104,
710		WLAN_CIPHER_SUITE_TKIP,
711		WLAN_CIPHER_SUITE_CCMP,
712
713		/* keep last -- depends on hw flags! */
714		WLAN_CIPHER_SUITE_AES_CMAC
715	};
716
717	if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
718#ifdef CONFIG_PM
719	    && (!local->ops->suspend || !local->ops->resume)
720#endif
721	    )
722		return -EINVAL;
723
724	if (hw->max_report_rates == 0)
725		hw->max_report_rates = hw->max_rates;
726
727	/*
728	 * generic code guarantees at least one band,
729	 * set this very early because much code assumes
730	 * that hw.conf.channel is assigned
731	 */
732	channels = 0;
733	max_bitrates = 0;
734	supp_ht = false;
735	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
736		struct ieee80211_supported_band *sband;
737
738		sband = local->hw.wiphy->bands[band];
739		if (!sband)
740			continue;
741		if (!local->oper_channel) {
742			/* init channel we're on */
743			local->hw.conf.channel =
744			local->oper_channel = &sband->channels[0];
745			local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
746		}
747		channels += sband->n_channels;
748
749		if (max_bitrates < sband->n_bitrates)
750			max_bitrates = sband->n_bitrates;
751		supp_ht = supp_ht || sband->ht_cap.ht_supported;
752	}
753
754	local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
755				      sizeof(void *) * channels, GFP_KERNEL);
756	if (!local->int_scan_req)
757		return -ENOMEM;
758
759	/* if low-level driver supports AP, we also support VLAN */
760	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
761		hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
762		hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
763	}
764
765	/* mac80211 always supports monitor */
766	hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
767	hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
768
769	/*
770	 * mac80211 doesn't support more than 1 channel, and also not more
771	 * than one IBSS interface
772	 */
773	for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
774		const struct ieee80211_iface_combination *c;
775		int j;
776
777		c = &hw->wiphy->iface_combinations[i];
778
779		if (c->num_different_channels > 1)
780			return -EINVAL;
781
782		for (j = 0; j < c->n_limits; j++)
783			if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
784			    c->limits[j].max > 1)
785				return -EINVAL;
786	}
787
788#ifndef CONFIG_MAC80211_MESH
789	/* mesh depends on Kconfig, but drivers should set it if they want */
790	local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
791#endif
792
793	/* if the underlying driver supports mesh, mac80211 will (at least)
794	 * provide routing of mesh authentication frames to userspace */
795	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
796		local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
797
798	/* mac80211 supports control port protocol changing */
799	local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
800
801	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
802		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
803	else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
804		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
805
806	WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
807	     && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
808	     "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
809
810	/*
811	 * Calculate scan IE length -- we need this to alloc
812	 * memory and to subtract from the driver limit. It
813	 * includes the DS Params, (extended) supported rates, and HT
814	 * information -- SSID is the driver's responsibility.
815	 */
816	local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
817		3 /* DS Params */;
818	if (supp_ht)
819		local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
820
821	if (!local->ops->hw_scan) {
822		/* For hw_scan, driver needs to set these up. */
823		local->hw.wiphy->max_scan_ssids = 4;
824		local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
825	}
826
827	/*
828	 * If the driver supports any scan IEs, then assume the
829	 * limit includes the IEs mac80211 will add, otherwise
830	 * leave it at zero and let the driver sort it out; we
831	 * still pass our IEs to the driver but userspace will
832	 * not be allowed to in that case.
833	 */
834	if (local->hw.wiphy->max_scan_ie_len)
835		local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
836
837	/* Set up cipher suites unless driver already did */
838	if (!local->hw.wiphy->cipher_suites) {
839		local->hw.wiphy->cipher_suites = cipher_suites;
840		local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
841		if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
842			local->hw.wiphy->n_cipher_suites--;
843	}
844	if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
845		if (local->hw.wiphy->cipher_suites == cipher_suites) {
846			local->hw.wiphy->cipher_suites += 2;
847			local->hw.wiphy->n_cipher_suites -= 2;
848		} else {
849			u32 *suites;
850			int r, w = 0;
851
852			/* Filter out WEP */
853
854			suites = kmemdup(
855				local->hw.wiphy->cipher_suites,
856				sizeof(u32) * local->hw.wiphy->n_cipher_suites,
857				GFP_KERNEL);
858			if (!suites)
859				return -ENOMEM;
860			for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
861				u32 suite = local->hw.wiphy->cipher_suites[r];
862				if (suite == WLAN_CIPHER_SUITE_WEP40 ||
863				    suite == WLAN_CIPHER_SUITE_WEP104)
864					continue;
865				suites[w++] = suite;
866			}
867			local->hw.wiphy->cipher_suites = suites;
868			local->hw.wiphy->n_cipher_suites = w;
869			local->wiphy_ciphers_allocated = true;
870		}
871	}
872
873	if (!local->ops->remain_on_channel)
874		local->hw.wiphy->max_remain_on_channel_duration = 5000;
875
876	if (local->ops->sched_scan_start)
877		local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
878
879	/* mac80211 based drivers don't support internal TDLS setup */
880	if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
881		local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
882
883	result = wiphy_register(local->hw.wiphy);
884	if (result < 0)
885		goto fail_wiphy_register;
886
887	/*
888	 * We use the number of queues for feature tests (QoS, HT) internally
889	 * so restrict them appropriately.
890	 */
891	if (hw->queues > IEEE80211_MAX_QUEUES)
892		hw->queues = IEEE80211_MAX_QUEUES;
893
894	local->workqueue =
895		alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
896	if (!local->workqueue) {
897		result = -ENOMEM;
898		goto fail_workqueue;
899	}
900
901	/*
902	 * The hardware needs headroom for sending the frame,
903	 * and we need some headroom for passing the frame to monitor
904	 * interfaces, but never both at the same time.
905	 */
906	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
907				   IEEE80211_TX_STATUS_HEADROOM);
908
909	debugfs_hw_add(local);
910
911	/*
912	 * if the driver doesn't specify a max listen interval we
913	 * use 5 which should be a safe default
914	 */
915	if (local->hw.max_listen_interval == 0)
916		local->hw.max_listen_interval = 5;
917
918	local->hw.conf.listen_interval = local->hw.max_listen_interval;
919
920	local->dynamic_ps_forced_timeout = -1;
921
922	result = ieee80211_wep_init(local);
923	if (result < 0)
924		wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
925			    result);
926
927	rtnl_lock();
928
929	result = ieee80211_init_rate_ctrl_alg(local,
930					      hw->rate_control_algorithm);
931	if (result < 0) {
932		wiphy_debug(local->hw.wiphy,
933			    "Failed to initialize rate control algorithm\n");
934		goto fail_rate;
935	}
936
937	/* add one default STA interface if supported */
938	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
939		result = ieee80211_if_add(local, "wlan%d", NULL,
940					  NL80211_IFTYPE_STATION, NULL);
941		if (result)
942			wiphy_warn(local->hw.wiphy,
943				   "Failed to add default virtual iface\n");
944	}
945
946	rtnl_unlock();
947
948	ieee80211_led_init(local);
949
950	local->network_latency_notifier.notifier_call =
951		ieee80211_max_network_latency;
952	result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
953				     &local->network_latency_notifier);
954	if (result) {
955		rtnl_lock();
956		goto fail_pm_qos;
957	}
958
959#ifdef CONFIG_INET
960	local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
961	result = register_inetaddr_notifier(&local->ifa_notifier);
962	if (result)
963		goto fail_ifa;
964#endif
965
966	netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
967			local->hw.napi_weight);
968
969	return 0;
970
971#ifdef CONFIG_INET
972 fail_ifa:
973	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
974			       &local->network_latency_notifier);
975	rtnl_lock();
976#endif
977 fail_pm_qos:
978	ieee80211_led_exit(local);
979	ieee80211_remove_interfaces(local);
980 fail_rate:
981	rtnl_unlock();
982	ieee80211_wep_free(local);
983	sta_info_stop(local);
984	destroy_workqueue(local->workqueue);
985 fail_workqueue:
986	wiphy_unregister(local->hw.wiphy);
987 fail_wiphy_register:
988	if (local->wiphy_ciphers_allocated)
989		kfree(local->hw.wiphy->cipher_suites);
990	kfree(local->int_scan_req);
991	return result;
992}
993EXPORT_SYMBOL(ieee80211_register_hw);
994
995void ieee80211_unregister_hw(struct ieee80211_hw *hw)
996{
997	struct ieee80211_local *local = hw_to_local(hw);
998
999	tasklet_kill(&local->tx_pending_tasklet);
1000	tasklet_kill(&local->tasklet);
1001
1002	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1003			       &local->network_latency_notifier);
1004#ifdef CONFIG_INET
1005	unregister_inetaddr_notifier(&local->ifa_notifier);
1006#endif
1007
1008	rtnl_lock();
1009
1010	/*
1011	 * At this point, interface list manipulations are fine
1012	 * because the driver cannot be handing us frames any
1013	 * more and the tasklet is killed.
1014	 */
1015	ieee80211_remove_interfaces(local);
1016
1017	rtnl_unlock();
1018
1019	/*
1020	 * Now all work items will be gone, but the
1021	 * timer might still be armed, so delete it
1022	 */
1023	del_timer_sync(&local->work_timer);
1024
1025	cancel_work_sync(&local->restart_work);
1026	cancel_work_sync(&local->reconfig_filter);
1027
1028	ieee80211_clear_tx_pending(local);
1029	rate_control_deinitialize(local);
1030
1031	if (skb_queue_len(&local->skb_queue) ||
1032	    skb_queue_len(&local->skb_queue_unreliable))
1033		wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1034	skb_queue_purge(&local->skb_queue);
1035	skb_queue_purge(&local->skb_queue_unreliable);
1036	skb_queue_purge(&local->rx_skb_queue);
1037
1038	destroy_workqueue(local->workqueue);
1039	wiphy_unregister(local->hw.wiphy);
1040	sta_info_stop(local);
1041	ieee80211_wep_free(local);
1042	ieee80211_led_exit(local);
1043	kfree(local->int_scan_req);
1044}
1045EXPORT_SYMBOL(ieee80211_unregister_hw);
1046
1047void ieee80211_free_hw(struct ieee80211_hw *hw)
1048{
1049	struct ieee80211_local *local = hw_to_local(hw);
1050
1051	mutex_destroy(&local->iflist_mtx);
1052	mutex_destroy(&local->mtx);
1053
1054	if (local->wiphy_ciphers_allocated)
1055		kfree(local->hw.wiphy->cipher_suites);
1056
1057	wiphy_free(local->hw.wiphy);
1058}
1059EXPORT_SYMBOL(ieee80211_free_hw);
1060
1061static int __init ieee80211_init(void)
1062{
1063	struct sk_buff *skb;
1064	int ret;
1065
1066	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1067	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1068		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1069
1070	ret = rc80211_minstrel_init();
1071	if (ret)
1072		return ret;
1073
1074	ret = rc80211_minstrel_ht_init();
1075	if (ret)
1076		goto err_minstrel;
1077
1078	ret = rc80211_pid_init();
1079	if (ret)
1080		goto err_pid;
1081
1082	ret = ieee80211_iface_init();
1083	if (ret)
1084		goto err_netdev;
1085
1086	return 0;
1087 err_netdev:
1088	rc80211_pid_exit();
1089 err_pid:
1090	rc80211_minstrel_ht_exit();
1091 err_minstrel:
1092	rc80211_minstrel_exit();
1093
1094	return ret;
1095}
1096
1097static void __exit ieee80211_exit(void)
1098{
1099	rc80211_pid_exit();
1100	rc80211_minstrel_ht_exit();
1101	rc80211_minstrel_exit();
1102
1103	if (mesh_allocated)
1104		ieee80211s_stop();
1105
1106	ieee80211_iface_exit();
1107
1108	rcu_barrier();
1109}
1110
1111
1112subsys_initcall(ieee80211_init);
1113module_exit(ieee80211_exit);
1114
1115MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1116MODULE_LICENSE("GPL");
1117