main.c revision b57e6b560fc2a2742910ac5ca0eb2c46e45aeac2 
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 || test_bit(SCAN_SW_SCANNING, &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
95int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
96{
97	struct ieee80211_channel *chan;
98	int ret = 0;
99	int power;
100	enum nl80211_channel_type channel_type;
101	u32 offchannel_flag;
102
103	might_sleep();
104
105	/* If this off-channel logic ever changes,  ieee80211_on_oper_channel
106	 * may need to change as well.
107	 */
108	offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
109	if (local->scan_channel) {
110		chan = local->scan_channel;
111		/* If scanning on oper channel, use whatever channel-type
112		 * is currently in use.
113		 */
114		if (chan == local->oper_channel)
115			channel_type = local->_oper_channel_type;
116		else
117			channel_type = NL80211_CHAN_NO_HT;
118	} else if (local->tmp_channel) {
119		chan = local->tmp_channel;
120		channel_type = local->tmp_channel_type;
121	} else {
122		chan = local->oper_channel;
123		channel_type = local->_oper_channel_type;
124	}
125
126	if (chan != local->oper_channel ||
127	    channel_type != local->_oper_channel_type)
128		local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
129	else
130		local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
131
132	offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
133
134	if (offchannel_flag || chan != local->hw.conf.channel ||
135	    channel_type != local->hw.conf.channel_type) {
136		local->hw.conf.channel = chan;
137		local->hw.conf.channel_type = channel_type;
138		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
139	}
140
141	if (!conf_is_ht(&local->hw.conf)) {
142		/*
143		 * mac80211.h documents that this is only valid
144		 * when the channel is set to an HT type, and
145		 * that otherwise STATIC is used.
146		 */
147		local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
148	} else if (local->hw.conf.smps_mode != local->smps_mode) {
149		local->hw.conf.smps_mode = local->smps_mode;
150		changed |= IEEE80211_CONF_CHANGE_SMPS;
151	}
152
153	if (test_bit(SCAN_SW_SCANNING, &local->scanning) ||
154	    test_bit(SCAN_HW_SCANNING, &local->scanning))
155		power = chan->max_power;
156	else
157		power = local->power_constr_level ?
158			(chan->max_power - local->power_constr_level) :
159			chan->max_power;
160
161	if (local->user_power_level >= 0)
162		power = min(power, local->user_power_level);
163
164	if (local->hw.conf.power_level != power) {
165		changed |= IEEE80211_CONF_CHANGE_POWER;
166		local->hw.conf.power_level = power;
167	}
168
169	if (changed && local->open_count) {
170		ret = drv_config(local, changed);
171		/*
172		 * Goal:
173		 * HW reconfiguration should never fail, the driver has told
174		 * us what it can support so it should live up to that promise.
175		 *
176		 * Current status:
177		 * rfkill is not integrated with mac80211 and a
178		 * configuration command can thus fail if hardware rfkill
179		 * is enabled
180		 *
181		 * FIXME: integrate rfkill with mac80211 and then add this
182		 * WARN_ON() back
183		 *
184		 */
185		/* WARN_ON(ret); */
186	}
187
188	return ret;
189}
190
191void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
192				      u32 changed)
193{
194	struct ieee80211_local *local = sdata->local;
195	static const u8 zero[ETH_ALEN] = { 0 };
196
197	if (!changed)
198		return;
199
200	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
201		/*
202		 * While not associated, claim a BSSID of all-zeroes
203		 * so that drivers don't do any weird things with the
204		 * BSSID at that time.
205		 */
206		if (sdata->vif.bss_conf.assoc)
207			sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
208		else
209			sdata->vif.bss_conf.bssid = zero;
210	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
211		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
212	else if (sdata->vif.type == NL80211_IFTYPE_AP)
213		sdata->vif.bss_conf.bssid = sdata->vif.addr;
214	else if (sdata->vif.type == NL80211_IFTYPE_WDS)
215		sdata->vif.bss_conf.bssid = NULL;
216	else if (ieee80211_vif_is_mesh(&sdata->vif)) {
217		sdata->vif.bss_conf.bssid = zero;
218	} else {
219		WARN_ON(1);
220		return;
221	}
222
223	switch (sdata->vif.type) {
224	case NL80211_IFTYPE_AP:
225	case NL80211_IFTYPE_ADHOC:
226	case NL80211_IFTYPE_WDS:
227	case NL80211_IFTYPE_MESH_POINT:
228		break;
229	default:
230		/* do not warn to simplify caller in scan.c */
231		changed &= ~BSS_CHANGED_BEACON_ENABLED;
232		if (WARN_ON(changed & BSS_CHANGED_BEACON))
233			return;
234		break;
235	}
236
237	if (changed & BSS_CHANGED_BEACON_ENABLED) {
238		if (local->quiescing || !ieee80211_sdata_running(sdata) ||
239		    test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
240			sdata->vif.bss_conf.enable_beacon = false;
241		} else {
242			/*
243			 * Beacon should be enabled, but AP mode must
244			 * check whether there is a beacon configured.
245			 */
246			switch (sdata->vif.type) {
247			case NL80211_IFTYPE_AP:
248				sdata->vif.bss_conf.enable_beacon =
249					!!sdata->u.ap.beacon;
250				break;
251			case NL80211_IFTYPE_ADHOC:
252				sdata->vif.bss_conf.enable_beacon =
253					!!sdata->u.ibss.presp;
254				break;
255#ifdef CONFIG_MAC80211_MESH
256			case NL80211_IFTYPE_MESH_POINT:
257				sdata->vif.bss_conf.enable_beacon =
258					!!sdata->u.mesh.mesh_id_len;
259				break;
260#endif
261			default:
262				/* not reached */
263				WARN_ON(1);
264				break;
265			}
266		}
267	}
268
269	drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
270}
271
272u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
273{
274	sdata->vif.bss_conf.use_cts_prot = false;
275	sdata->vif.bss_conf.use_short_preamble = false;
276	sdata->vif.bss_conf.use_short_slot = false;
277	return BSS_CHANGED_ERP_CTS_PROT |
278	       BSS_CHANGED_ERP_PREAMBLE |
279	       BSS_CHANGED_ERP_SLOT;
280}
281
282static void ieee80211_tasklet_handler(unsigned long data)
283{
284	struct ieee80211_local *local = (struct ieee80211_local *) data;
285	struct sta_info *sta, *tmp;
286	struct skb_eosp_msg_data *eosp_data;
287	struct sk_buff *skb;
288
289	while ((skb = skb_dequeue(&local->skb_queue)) ||
290	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
291		switch (skb->pkt_type) {
292		case IEEE80211_RX_MSG:
293			/* Clear skb->pkt_type in order to not confuse kernel
294			 * netstack. */
295			skb->pkt_type = 0;
296			ieee80211_rx(local_to_hw(local), skb);
297			break;
298		case IEEE80211_TX_STATUS_MSG:
299			skb->pkt_type = 0;
300			ieee80211_tx_status(local_to_hw(local), skb);
301			break;
302		case IEEE80211_EOSP_MSG:
303			eosp_data = (void *)skb->cb;
304			for_each_sta_info(local, eosp_data->sta, sta, tmp) {
305				/* skip wrong virtual interface */
306				if (memcmp(eosp_data->iface,
307					   sta->sdata->vif.addr, ETH_ALEN))
308					continue;
309				clear_sta_flag(sta, WLAN_STA_SP);
310				break;
311			}
312			dev_kfree_skb(skb);
313			break;
314		default:
315			WARN(1, "mac80211: Packet is of unknown type %d\n",
316			     skb->pkt_type);
317			dev_kfree_skb(skb);
318			break;
319		}
320	}
321}
322
323static void ieee80211_restart_work(struct work_struct *work)
324{
325	struct ieee80211_local *local =
326		container_of(work, struct ieee80211_local, restart_work);
327
328	/* wait for scan work complete */
329	flush_workqueue(local->workqueue);
330
331	mutex_lock(&local->mtx);
332	WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
333	     local->sched_scanning,
334		"%s called with hardware scan in progress\n", __func__);
335	mutex_unlock(&local->mtx);
336
337	rtnl_lock();
338	ieee80211_scan_cancel(local);
339	ieee80211_reconfig(local);
340	rtnl_unlock();
341}
342
343void ieee80211_restart_hw(struct ieee80211_hw *hw)
344{
345	struct ieee80211_local *local = hw_to_local(hw);
346
347	trace_api_restart_hw(local);
348
349	wiphy_info(hw->wiphy,
350		   "Hardware restart was requested\n");
351
352	/* use this reason, ieee80211_reconfig will unblock it */
353	ieee80211_stop_queues_by_reason(hw,
354		IEEE80211_QUEUE_STOP_REASON_SUSPEND);
355
356	schedule_work(&local->restart_work);
357}
358EXPORT_SYMBOL(ieee80211_restart_hw);
359
360static void ieee80211_recalc_smps_work(struct work_struct *work)
361{
362	struct ieee80211_local *local =
363		container_of(work, struct ieee80211_local, recalc_smps);
364
365	mutex_lock(&local->iflist_mtx);
366	ieee80211_recalc_smps(local);
367	mutex_unlock(&local->iflist_mtx);
368}
369
370#ifdef CONFIG_INET
371static int ieee80211_ifa_changed(struct notifier_block *nb,
372				 unsigned long data, void *arg)
373{
374	struct in_ifaddr *ifa = arg;
375	struct ieee80211_local *local =
376		container_of(nb, struct ieee80211_local,
377			     ifa_notifier);
378	struct net_device *ndev = ifa->ifa_dev->dev;
379	struct wireless_dev *wdev = ndev->ieee80211_ptr;
380	struct in_device *idev;
381	struct ieee80211_sub_if_data *sdata;
382	struct ieee80211_bss_conf *bss_conf;
383	struct ieee80211_if_managed *ifmgd;
384	int c = 0;
385
386	/* Make sure it's our interface that got changed */
387	if (!wdev)
388		return NOTIFY_DONE;
389
390	if (wdev->wiphy != local->hw.wiphy)
391		return NOTIFY_DONE;
392
393	sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
394	bss_conf = &sdata->vif.bss_conf;
395
396	/* ARP filtering is only supported in managed mode */
397	if (sdata->vif.type != NL80211_IFTYPE_STATION)
398		return NOTIFY_DONE;
399
400	idev = __in_dev_get_rtnl(sdata->dev);
401	if (!idev)
402		return NOTIFY_DONE;
403
404	ifmgd = &sdata->u.mgd;
405	mutex_lock(&ifmgd->mtx);
406
407	/* Copy the addresses to the bss_conf list */
408	ifa = idev->ifa_list;
409	while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
410		bss_conf->arp_addr_list[c] = ifa->ifa_address;
411		ifa = ifa->ifa_next;
412		c++;
413	}
414
415	/* If not all addresses fit the list, disable filtering */
416	if (ifa) {
417		sdata->arp_filter_state = false;
418		c = 0;
419	} else {
420		sdata->arp_filter_state = true;
421	}
422	bss_conf->arp_addr_cnt = c;
423
424	/* Configure driver only if associated (which also implies it is up) */
425	if (ifmgd->associated) {
426		bss_conf->arp_filter_enabled = sdata->arp_filter_state;
427		ieee80211_bss_info_change_notify(sdata,
428						 BSS_CHANGED_ARP_FILTER);
429	}
430
431	mutex_unlock(&ifmgd->mtx);
432
433	return NOTIFY_DONE;
434}
435#endif
436
437static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
438{
439	struct ieee80211_local *local =
440		container_of(napi, struct ieee80211_local, napi);
441
442	return local->ops->napi_poll(&local->hw, budget);
443}
444
445void ieee80211_napi_schedule(struct ieee80211_hw *hw)
446{
447	struct ieee80211_local *local = hw_to_local(hw);
448
449	napi_schedule(&local->napi);
450}
451EXPORT_SYMBOL(ieee80211_napi_schedule);
452
453void ieee80211_napi_complete(struct ieee80211_hw *hw)
454{
455	struct ieee80211_local *local = hw_to_local(hw);
456
457	napi_complete(&local->napi);
458}
459EXPORT_SYMBOL(ieee80211_napi_complete);
460
461/* There isn't a lot of sense in it, but you can transmit anything you like */
462static const struct ieee80211_txrx_stypes
463ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
464	[NL80211_IFTYPE_ADHOC] = {
465		.tx = 0xffff,
466		.rx = BIT(IEEE80211_STYPE_ACTION >> 4),
467	},
468	[NL80211_IFTYPE_STATION] = {
469		.tx = 0xffff,
470		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
471			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
472	},
473	[NL80211_IFTYPE_AP] = {
474		.tx = 0xffff,
475		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
476			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
477			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
478			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
479			BIT(IEEE80211_STYPE_AUTH >> 4) |
480			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
481			BIT(IEEE80211_STYPE_ACTION >> 4),
482	},
483	[NL80211_IFTYPE_AP_VLAN] = {
484		/* copy AP */
485		.tx = 0xffff,
486		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
487			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
488			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
489			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
490			BIT(IEEE80211_STYPE_AUTH >> 4) |
491			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
492			BIT(IEEE80211_STYPE_ACTION >> 4),
493	},
494	[NL80211_IFTYPE_P2P_CLIENT] = {
495		.tx = 0xffff,
496		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
497			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
498	},
499	[NL80211_IFTYPE_P2P_GO] = {
500		.tx = 0xffff,
501		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
502			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
503			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
504			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
505			BIT(IEEE80211_STYPE_AUTH >> 4) |
506			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
507			BIT(IEEE80211_STYPE_ACTION >> 4),
508	},
509	[NL80211_IFTYPE_MESH_POINT] = {
510		.tx = 0xffff,
511		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
512			BIT(IEEE80211_STYPE_AUTH >> 4) |
513			BIT(IEEE80211_STYPE_DEAUTH >> 4),
514	},
515};
516
517static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
518	.ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
519			     IEEE80211_HT_AMPDU_PARM_DENSITY,
520
521	.cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
522				IEEE80211_HT_CAP_MAX_AMSDU |
523				IEEE80211_HT_CAP_SGI_40),
524	.mcs = {
525		.rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
526			     0xff, 0xff, 0xff, 0xff, 0xff, },
527	},
528};
529
530struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
531					const struct ieee80211_ops *ops)
532{
533	struct ieee80211_local *local;
534	int priv_size, i;
535	struct wiphy *wiphy;
536
537	/* Ensure 32-byte alignment of our private data and hw private data.
538	 * We use the wiphy priv data for both our ieee80211_local and for
539	 * the driver's private data
540	 *
541	 * In memory it'll be like this:
542	 *
543	 * +-------------------------+
544	 * | struct wiphy	    |
545	 * +-------------------------+
546	 * | struct ieee80211_local  |
547	 * +-------------------------+
548	 * | driver's private data   |
549	 * +-------------------------+
550	 *
551	 */
552	priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
553
554	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
555
556	if (!wiphy)
557		return NULL;
558
559	wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
560
561	wiphy->privid = mac80211_wiphy_privid;
562
563	wiphy->flags |= WIPHY_FLAG_NETNS_OK |
564			WIPHY_FLAG_4ADDR_AP |
565			WIPHY_FLAG_4ADDR_STATION |
566			WIPHY_FLAG_REPORTS_OBSS |
567			WIPHY_FLAG_OFFCHAN_TX |
568			WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
569
570	wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
571			  NL80211_FEATURE_HT_IBSS;
572
573	if (!ops->set_key)
574		wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
575
576	wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
577
578	local = wiphy_priv(wiphy);
579
580	local->hw.wiphy = wiphy;
581
582	local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
583
584	BUG_ON(!ops->tx && !ops->tx_frags);
585	BUG_ON(!ops->start);
586	BUG_ON(!ops->stop);
587	BUG_ON(!ops->config);
588	BUG_ON(!ops->add_interface);
589	BUG_ON(!ops->remove_interface);
590	BUG_ON(!ops->configure_filter);
591	local->ops = ops;
592
593	/* set up some defaults */
594	local->hw.queues = 1;
595	local->hw.max_rates = 1;
596	local->hw.max_report_rates = 0;
597	local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
598	local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
599	local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
600	local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
601	local->user_power_level = -1;
602	local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
603	local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
604	wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
605
606	INIT_LIST_HEAD(&local->interfaces);
607
608	__hw_addr_init(&local->mc_list);
609
610	mutex_init(&local->iflist_mtx);
611	mutex_init(&local->mtx);
612
613	mutex_init(&local->key_mtx);
614	spin_lock_init(&local->filter_lock);
615	spin_lock_init(&local->queue_stop_reason_lock);
616
617	/*
618	 * The rx_skb_queue is only accessed from tasklets,
619	 * but other SKB queues are used from within IRQ
620	 * context. Therefore, this one needs a different
621	 * locking class so our direct, non-irq-safe use of
622	 * the queue's lock doesn't throw lockdep warnings.
623	 */
624	skb_queue_head_init_class(&local->rx_skb_queue,
625				  &ieee80211_rx_skb_queue_class);
626
627	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
628
629	ieee80211_work_init(local);
630
631	INIT_WORK(&local->restart_work, ieee80211_restart_work);
632
633	INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
634	INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
635	local->smps_mode = IEEE80211_SMPS_OFF;
636
637	INIT_WORK(&local->dynamic_ps_enable_work,
638		  ieee80211_dynamic_ps_enable_work);
639	INIT_WORK(&local->dynamic_ps_disable_work,
640		  ieee80211_dynamic_ps_disable_work);
641	setup_timer(&local->dynamic_ps_timer,
642		    ieee80211_dynamic_ps_timer, (unsigned long) local);
643
644	INIT_WORK(&local->sched_scan_stopped_work,
645		  ieee80211_sched_scan_stopped_work);
646
647	spin_lock_init(&local->ack_status_lock);
648	idr_init(&local->ack_status_frames);
649	/* preallocate at least one entry */
650	idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
651
652	sta_info_init(local);
653
654	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
655		skb_queue_head_init(&local->pending[i]);
656		atomic_set(&local->agg_queue_stop[i], 0);
657	}
658	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
659		     (unsigned long)local);
660
661	tasklet_init(&local->tasklet,
662		     ieee80211_tasklet_handler,
663		     (unsigned long) local);
664
665	skb_queue_head_init(&local->skb_queue);
666	skb_queue_head_init(&local->skb_queue_unreliable);
667
668	/* init dummy netdev for use w/ NAPI */
669	init_dummy_netdev(&local->napi_dev);
670
671	ieee80211_led_names(local);
672
673	ieee80211_hw_roc_setup(local);
674
675	return local_to_hw(local);
676}
677EXPORT_SYMBOL(ieee80211_alloc_hw);
678
679int ieee80211_register_hw(struct ieee80211_hw *hw)
680{
681	struct ieee80211_local *local = hw_to_local(hw);
682	int result, i;
683	enum ieee80211_band band;
684	int channels, max_bitrates;
685	bool supp_ht;
686	static const u32 cipher_suites[] = {
687		/* keep WEP first, it may be removed below */
688		WLAN_CIPHER_SUITE_WEP40,
689		WLAN_CIPHER_SUITE_WEP104,
690		WLAN_CIPHER_SUITE_TKIP,
691		WLAN_CIPHER_SUITE_CCMP,
692
693		/* keep last -- depends on hw flags! */
694		WLAN_CIPHER_SUITE_AES_CMAC
695	};
696
697	if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
698#ifdef CONFIG_PM
699	    && (!local->ops->suspend || !local->ops->resume)
700#endif
701	    )
702		return -EINVAL;
703
704	if (hw->max_report_rates == 0)
705		hw->max_report_rates = hw->max_rates;
706
707	/*
708	 * generic code guarantees at least one band,
709	 * set this very early because much code assumes
710	 * that hw.conf.channel is assigned
711	 */
712	channels = 0;
713	max_bitrates = 0;
714	supp_ht = false;
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			continue;
721		if (!local->oper_channel) {
722			/* init channel we're on */
723			local->hw.conf.channel =
724			local->oper_channel = &sband->channels[0];
725			local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
726		}
727		channels += sband->n_channels;
728
729		if (max_bitrates < sband->n_bitrates)
730			max_bitrates = sband->n_bitrates;
731		supp_ht = supp_ht || sband->ht_cap.ht_supported;
732	}
733
734	local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
735				      sizeof(void *) * channels, GFP_KERNEL);
736	if (!local->int_scan_req)
737		return -ENOMEM;
738
739	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
740		if (!local->hw.wiphy->bands[band])
741			continue;
742		local->int_scan_req->rates[band] = (u32) -1;
743	}
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	/* mac80211 based drivers don't support internal TDLS setup */
866	if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
867		local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
868
869	result = wiphy_register(local->hw.wiphy);
870	if (result < 0)
871		goto fail_wiphy_register;
872
873	/*
874	 * We use the number of queues for feature tests (QoS, HT) internally
875	 * so restrict them appropriately.
876	 */
877	if (hw->queues > IEEE80211_MAX_QUEUES)
878		hw->queues = IEEE80211_MAX_QUEUES;
879
880	local->workqueue =
881		alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
882	if (!local->workqueue) {
883		result = -ENOMEM;
884		goto fail_workqueue;
885	}
886
887	/*
888	 * The hardware needs headroom for sending the frame,
889	 * and we need some headroom for passing the frame to monitor
890	 * interfaces, but never both at the same time.
891	 */
892	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
893				   IEEE80211_TX_STATUS_HEADROOM);
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	ieee80211_led_init(local);
914
915	rtnl_lock();
916
917	result = ieee80211_init_rate_ctrl_alg(local,
918					      hw->rate_control_algorithm);
919	if (result < 0) {
920		wiphy_debug(local->hw.wiphy,
921			    "Failed to initialize rate control algorithm\n");
922		goto fail_rate;
923	}
924
925	/* add one default STA interface if supported */
926	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
927		result = ieee80211_if_add(local, "wlan%d", NULL,
928					  NL80211_IFTYPE_STATION, NULL);
929		if (result)
930			wiphy_warn(local->hw.wiphy,
931				   "Failed to add default virtual iface\n");
932	}
933
934	rtnl_unlock();
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	rate_control_deinitialize(local);
1016
1017	if (skb_queue_len(&local->skb_queue) ||
1018	    skb_queue_len(&local->skb_queue_unreliable))
1019		wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1020	skb_queue_purge(&local->skb_queue);
1021	skb_queue_purge(&local->skb_queue_unreliable);
1022	skb_queue_purge(&local->rx_skb_queue);
1023
1024	destroy_workqueue(local->workqueue);
1025	wiphy_unregister(local->hw.wiphy);
1026	sta_info_stop(local);
1027	ieee80211_wep_free(local);
1028	ieee80211_led_exit(local);
1029	kfree(local->int_scan_req);
1030}
1031EXPORT_SYMBOL(ieee80211_unregister_hw);
1032
1033static int ieee80211_free_ack_frame(int id, void *p, void *data)
1034{
1035	WARN_ONCE(1, "Have pending ack frames!\n");
1036	kfree_skb(p);
1037	return 0;
1038}
1039
1040void ieee80211_free_hw(struct ieee80211_hw *hw)
1041{
1042	struct ieee80211_local *local = hw_to_local(hw);
1043
1044	mutex_destroy(&local->iflist_mtx);
1045	mutex_destroy(&local->mtx);
1046
1047	if (local->wiphy_ciphers_allocated)
1048		kfree(local->hw.wiphy->cipher_suites);
1049
1050	idr_for_each(&local->ack_status_frames,
1051		     ieee80211_free_ack_frame, NULL);
1052	idr_destroy(&local->ack_status_frames);
1053
1054	wiphy_free(local->hw.wiphy);
1055}
1056EXPORT_SYMBOL(ieee80211_free_hw);
1057
1058static int __init ieee80211_init(void)
1059{
1060	struct sk_buff *skb;
1061	int ret;
1062
1063	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1064	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1065		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1066
1067	ret = rc80211_minstrel_init();
1068	if (ret)
1069		return ret;
1070
1071	ret = rc80211_minstrel_ht_init();
1072	if (ret)
1073		goto err_minstrel;
1074
1075	ret = rc80211_pid_init();
1076	if (ret)
1077		goto err_pid;
1078
1079	ret = ieee80211_iface_init();
1080	if (ret)
1081		goto err_netdev;
1082
1083	return 0;
1084 err_netdev:
1085	rc80211_pid_exit();
1086 err_pid:
1087	rc80211_minstrel_ht_exit();
1088 err_minstrel:
1089	rc80211_minstrel_exit();
1090
1091	return ret;
1092}
1093
1094static void __exit ieee80211_exit(void)
1095{
1096	rc80211_pid_exit();
1097	rc80211_minstrel_ht_exit();
1098	rc80211_minstrel_exit();
1099
1100	if (mesh_allocated)
1101		ieee80211s_stop();
1102
1103	ieee80211_iface_exit();
1104
1105	rcu_barrier();
1106}
1107
1108
1109subsys_initcall(ieee80211_init);
1110module_exit(ieee80211_exit);
1111
1112MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1113MODULE_LICENSE("GPL");
1114