main.c revision f09603a259ffef69ad4516a04eb06cd65ac522fe 
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			min(chan->max_power,
159				(chan->max_reg_power  - local->power_constr_level)) :
160			chan->max_power;
161
162	if (local->user_power_level >= 0)
163		power = min(power, local->user_power_level);
164
165	if (local->hw.conf.power_level != power) {
166		changed |= IEEE80211_CONF_CHANGE_POWER;
167		local->hw.conf.power_level = power;
168	}
169
170	if (changed && local->open_count) {
171		ret = drv_config(local, changed);
172		/*
173		 * Goal:
174		 * HW reconfiguration should never fail, the driver has told
175		 * us what it can support so it should live up to that promise.
176		 *
177		 * Current status:
178		 * rfkill is not integrated with mac80211 and a
179		 * configuration command can thus fail if hardware rfkill
180		 * is enabled
181		 *
182		 * FIXME: integrate rfkill with mac80211 and then add this
183		 * WARN_ON() back
184		 *
185		 */
186		/* WARN_ON(ret); */
187	}
188
189	return ret;
190}
191
192void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
193				      u32 changed)
194{
195	struct ieee80211_local *local = sdata->local;
196	static const u8 zero[ETH_ALEN] = { 0 };
197
198	if (!changed)
199		return;
200
201	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
202		/*
203		 * While not associated, claim a BSSID of all-zeroes
204		 * so that drivers don't do any weird things with the
205		 * BSSID at that time.
206		 */
207		if (sdata->vif.bss_conf.assoc)
208			sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
209		else
210			sdata->vif.bss_conf.bssid = zero;
211	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
212		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
213	else if (sdata->vif.type == NL80211_IFTYPE_AP)
214		sdata->vif.bss_conf.bssid = sdata->vif.addr;
215	else if (sdata->vif.type == NL80211_IFTYPE_WDS)
216		sdata->vif.bss_conf.bssid = NULL;
217	else if (ieee80211_vif_is_mesh(&sdata->vif)) {
218		sdata->vif.bss_conf.bssid = zero;
219	} else {
220		WARN_ON(1);
221		return;
222	}
223
224	switch (sdata->vif.type) {
225	case NL80211_IFTYPE_AP:
226	case NL80211_IFTYPE_ADHOC:
227	case NL80211_IFTYPE_WDS:
228	case NL80211_IFTYPE_MESH_POINT:
229		break;
230	default:
231		/* do not warn to simplify caller in scan.c */
232		changed &= ~BSS_CHANGED_BEACON_ENABLED;
233		if (WARN_ON(changed & BSS_CHANGED_BEACON))
234			return;
235		break;
236	}
237
238	if (changed & BSS_CHANGED_BEACON_ENABLED) {
239		if (local->quiescing || !ieee80211_sdata_running(sdata) ||
240		    test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
241			sdata->vif.bss_conf.enable_beacon = false;
242		} else {
243			/*
244			 * Beacon should be enabled, but AP mode must
245			 * check whether there is a beacon configured.
246			 */
247			switch (sdata->vif.type) {
248			case NL80211_IFTYPE_AP:
249				sdata->vif.bss_conf.enable_beacon =
250					!!sdata->u.ap.beacon;
251				break;
252			case NL80211_IFTYPE_ADHOC:
253				sdata->vif.bss_conf.enable_beacon =
254					!!sdata->u.ibss.presp;
255				break;
256#ifdef CONFIG_MAC80211_MESH
257			case NL80211_IFTYPE_MESH_POINT:
258				sdata->vif.bss_conf.enable_beacon =
259					!!sdata->u.mesh.mesh_id_len;
260				break;
261#endif
262			default:
263				/* not reached */
264				WARN_ON(1);
265				break;
266			}
267		}
268	}
269
270	drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
271}
272
273u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
274{
275	sdata->vif.bss_conf.use_cts_prot = false;
276	sdata->vif.bss_conf.use_short_preamble = false;
277	sdata->vif.bss_conf.use_short_slot = false;
278	return BSS_CHANGED_ERP_CTS_PROT |
279	       BSS_CHANGED_ERP_PREAMBLE |
280	       BSS_CHANGED_ERP_SLOT;
281}
282
283static void ieee80211_tasklet_handler(unsigned long data)
284{
285	struct ieee80211_local *local = (struct ieee80211_local *) data;
286	struct sta_info *sta, *tmp;
287	struct skb_eosp_msg_data *eosp_data;
288	struct sk_buff *skb;
289
290	while ((skb = skb_dequeue(&local->skb_queue)) ||
291	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
292		switch (skb->pkt_type) {
293		case IEEE80211_RX_MSG:
294			/* Clear skb->pkt_type in order to not confuse kernel
295			 * netstack. */
296			skb->pkt_type = 0;
297			ieee80211_rx(local_to_hw(local), skb);
298			break;
299		case IEEE80211_TX_STATUS_MSG:
300			skb->pkt_type = 0;
301			ieee80211_tx_status(local_to_hw(local), skb);
302			break;
303		case IEEE80211_EOSP_MSG:
304			eosp_data = (void *)skb->cb;
305			for_each_sta_info(local, eosp_data->sta, sta, tmp) {
306				/* skip wrong virtual interface */
307				if (memcmp(eosp_data->iface,
308					   sta->sdata->vif.addr, ETH_ALEN))
309					continue;
310				clear_sta_flag(sta, WLAN_STA_SP);
311				break;
312			}
313			dev_kfree_skb(skb);
314			break;
315		default:
316			WARN(1, "mac80211: Packet is of unknown type %d\n",
317			     skb->pkt_type);
318			dev_kfree_skb(skb);
319			break;
320		}
321	}
322}
323
324static void ieee80211_restart_work(struct work_struct *work)
325{
326	struct ieee80211_local *local =
327		container_of(work, struct ieee80211_local, restart_work);
328
329	/* wait for scan work complete */
330	flush_workqueue(local->workqueue);
331
332	mutex_lock(&local->mtx);
333	WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
334	     local->sched_scanning,
335		"%s called with hardware scan in progress\n", __func__);
336	mutex_unlock(&local->mtx);
337
338	rtnl_lock();
339	ieee80211_scan_cancel(local);
340	ieee80211_reconfig(local);
341	rtnl_unlock();
342}
343
344void ieee80211_restart_hw(struct ieee80211_hw *hw)
345{
346	struct ieee80211_local *local = hw_to_local(hw);
347
348	trace_api_restart_hw(local);
349
350	wiphy_info(hw->wiphy,
351		   "Hardware restart was requested\n");
352
353	/* use this reason, ieee80211_reconfig will unblock it */
354	ieee80211_stop_queues_by_reason(hw,
355		IEEE80211_QUEUE_STOP_REASON_SUSPEND);
356
357	schedule_work(&local->restart_work);
358}
359EXPORT_SYMBOL(ieee80211_restart_hw);
360
361static void ieee80211_recalc_smps_work(struct work_struct *work)
362{
363	struct ieee80211_local *local =
364		container_of(work, struct ieee80211_local, recalc_smps);
365
366	mutex_lock(&local->iflist_mtx);
367	ieee80211_recalc_smps(local);
368	mutex_unlock(&local->iflist_mtx);
369}
370
371#ifdef CONFIG_INET
372static int ieee80211_ifa_changed(struct notifier_block *nb,
373				 unsigned long data, void *arg)
374{
375	struct in_ifaddr *ifa = arg;
376	struct ieee80211_local *local =
377		container_of(nb, struct ieee80211_local,
378			     ifa_notifier);
379	struct net_device *ndev = ifa->ifa_dev->dev;
380	struct wireless_dev *wdev = ndev->ieee80211_ptr;
381	struct in_device *idev;
382	struct ieee80211_sub_if_data *sdata;
383	struct ieee80211_bss_conf *bss_conf;
384	struct ieee80211_if_managed *ifmgd;
385	int c = 0;
386
387	/* Make sure it's our interface that got changed */
388	if (!wdev)
389		return NOTIFY_DONE;
390
391	if (wdev->wiphy != local->hw.wiphy)
392		return NOTIFY_DONE;
393
394	sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
395	bss_conf = &sdata->vif.bss_conf;
396
397	/* ARP filtering is only supported in managed mode */
398	if (sdata->vif.type != NL80211_IFTYPE_STATION)
399		return NOTIFY_DONE;
400
401	idev = __in_dev_get_rtnl(sdata->dev);
402	if (!idev)
403		return NOTIFY_DONE;
404
405	ifmgd = &sdata->u.mgd;
406	mutex_lock(&ifmgd->mtx);
407
408	/* Copy the addresses to the bss_conf list */
409	ifa = idev->ifa_list;
410	while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
411		bss_conf->arp_addr_list[c] = ifa->ifa_address;
412		ifa = ifa->ifa_next;
413		c++;
414	}
415
416	/* If not all addresses fit the list, disable filtering */
417	if (ifa) {
418		sdata->arp_filter_state = false;
419		c = 0;
420	} else {
421		sdata->arp_filter_state = true;
422	}
423	bss_conf->arp_addr_cnt = c;
424
425	/* Configure driver only if associated (which also implies it is up) */
426	if (ifmgd->associated) {
427		bss_conf->arp_filter_enabled = sdata->arp_filter_state;
428		ieee80211_bss_info_change_notify(sdata,
429						 BSS_CHANGED_ARP_FILTER);
430	}
431
432	mutex_unlock(&ifmgd->mtx);
433
434	return NOTIFY_DONE;
435}
436#endif
437
438static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
439{
440	struct ieee80211_local *local =
441		container_of(napi, struct ieee80211_local, napi);
442
443	return local->ops->napi_poll(&local->hw, budget);
444}
445
446void ieee80211_napi_schedule(struct ieee80211_hw *hw)
447{
448	struct ieee80211_local *local = hw_to_local(hw);
449
450	napi_schedule(&local->napi);
451}
452EXPORT_SYMBOL(ieee80211_napi_schedule);
453
454void ieee80211_napi_complete(struct ieee80211_hw *hw)
455{
456	struct ieee80211_local *local = hw_to_local(hw);
457
458	napi_complete(&local->napi);
459}
460EXPORT_SYMBOL(ieee80211_napi_complete);
461
462/* There isn't a lot of sense in it, but you can transmit anything you like */
463static const struct ieee80211_txrx_stypes
464ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
465	[NL80211_IFTYPE_ADHOC] = {
466		.tx = 0xffff,
467		.rx = BIT(IEEE80211_STYPE_ACTION >> 4),
468	},
469	[NL80211_IFTYPE_STATION] = {
470		.tx = 0xffff,
471		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
472			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
473	},
474	[NL80211_IFTYPE_AP] = {
475		.tx = 0xffff,
476		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
477			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
478			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
479			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
480			BIT(IEEE80211_STYPE_AUTH >> 4) |
481			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
482			BIT(IEEE80211_STYPE_ACTION >> 4),
483	},
484	[NL80211_IFTYPE_AP_VLAN] = {
485		/* copy AP */
486		.tx = 0xffff,
487		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
488			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
489			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
490			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
491			BIT(IEEE80211_STYPE_AUTH >> 4) |
492			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
493			BIT(IEEE80211_STYPE_ACTION >> 4),
494	},
495	[NL80211_IFTYPE_P2P_CLIENT] = {
496		.tx = 0xffff,
497		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
498			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
499	},
500	[NL80211_IFTYPE_P2P_GO] = {
501		.tx = 0xffff,
502		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
503			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
504			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
505			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
506			BIT(IEEE80211_STYPE_AUTH >> 4) |
507			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
508			BIT(IEEE80211_STYPE_ACTION >> 4),
509	},
510	[NL80211_IFTYPE_MESH_POINT] = {
511		.tx = 0xffff,
512		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
513			BIT(IEEE80211_STYPE_AUTH >> 4) |
514			BIT(IEEE80211_STYPE_DEAUTH >> 4),
515	},
516};
517
518static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
519	.ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
520			     IEEE80211_HT_AMPDU_PARM_DENSITY,
521
522	.cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
523				IEEE80211_HT_CAP_MAX_AMSDU |
524				IEEE80211_HT_CAP_SGI_40),
525	.mcs = {
526		.rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
527			     0xff, 0xff, 0xff, 0xff, 0xff, },
528	},
529};
530
531struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
532					const struct ieee80211_ops *ops)
533{
534	struct ieee80211_local *local;
535	int priv_size, i;
536	struct wiphy *wiphy;
537
538	if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
539		return NULL;
540
541	/* Ensure 32-byte alignment of our private data and hw private data.
542	 * We use the wiphy priv data for both our ieee80211_local and for
543	 * the driver's private data
544	 *
545	 * In memory it'll be like this:
546	 *
547	 * +-------------------------+
548	 * | struct wiphy	    |
549	 * +-------------------------+
550	 * | struct ieee80211_local  |
551	 * +-------------------------+
552	 * | driver's private data   |
553	 * +-------------------------+
554	 *
555	 */
556	priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
557
558	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
559
560	if (!wiphy)
561		return NULL;
562
563	wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
564
565	wiphy->privid = mac80211_wiphy_privid;
566
567	wiphy->flags |= WIPHY_FLAG_NETNS_OK |
568			WIPHY_FLAG_4ADDR_AP |
569			WIPHY_FLAG_4ADDR_STATION |
570			WIPHY_FLAG_REPORTS_OBSS |
571			WIPHY_FLAG_OFFCHAN_TX |
572			WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
573
574	wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
575			  NL80211_FEATURE_HT_IBSS;
576
577	if (!ops->set_key)
578		wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
579
580	wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
581
582	local = wiphy_priv(wiphy);
583
584	local->hw.wiphy = wiphy;
585
586	local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
587
588	BUG_ON(!ops->tx && !ops->tx_frags);
589	BUG_ON(!ops->start);
590	BUG_ON(!ops->stop);
591	BUG_ON(!ops->config);
592	BUG_ON(!ops->add_interface);
593	BUG_ON(!ops->remove_interface);
594	BUG_ON(!ops->configure_filter);
595	local->ops = ops;
596
597	/* set up some defaults */
598	local->hw.queues = 1;
599	local->hw.max_rates = 1;
600	local->hw.max_report_rates = 0;
601	local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
602	local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
603	local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
604	local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
605	local->user_power_level = -1;
606	local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
607	local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
608	wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
609
610	INIT_LIST_HEAD(&local->interfaces);
611
612	__hw_addr_init(&local->mc_list);
613
614	mutex_init(&local->iflist_mtx);
615	mutex_init(&local->mtx);
616
617	mutex_init(&local->key_mtx);
618	spin_lock_init(&local->filter_lock);
619	spin_lock_init(&local->queue_stop_reason_lock);
620
621	/*
622	 * The rx_skb_queue is only accessed from tasklets,
623	 * but other SKB queues are used from within IRQ
624	 * context. Therefore, this one needs a different
625	 * locking class so our direct, non-irq-safe use of
626	 * the queue's lock doesn't throw lockdep warnings.
627	 */
628	skb_queue_head_init_class(&local->rx_skb_queue,
629				  &ieee80211_rx_skb_queue_class);
630
631	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
632
633	ieee80211_work_init(local);
634
635	INIT_WORK(&local->restart_work, ieee80211_restart_work);
636
637	INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
638	INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
639	local->smps_mode = IEEE80211_SMPS_OFF;
640
641	INIT_WORK(&local->dynamic_ps_enable_work,
642		  ieee80211_dynamic_ps_enable_work);
643	INIT_WORK(&local->dynamic_ps_disable_work,
644		  ieee80211_dynamic_ps_disable_work);
645	setup_timer(&local->dynamic_ps_timer,
646		    ieee80211_dynamic_ps_timer, (unsigned long) local);
647
648	INIT_WORK(&local->sched_scan_stopped_work,
649		  ieee80211_sched_scan_stopped_work);
650
651	spin_lock_init(&local->ack_status_lock);
652	idr_init(&local->ack_status_frames);
653	/* preallocate at least one entry */
654	idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
655
656	sta_info_init(local);
657
658	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
659		skb_queue_head_init(&local->pending[i]);
660		atomic_set(&local->agg_queue_stop[i], 0);
661	}
662	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
663		     (unsigned long)local);
664
665	tasklet_init(&local->tasklet,
666		     ieee80211_tasklet_handler,
667		     (unsigned long) local);
668
669	skb_queue_head_init(&local->skb_queue);
670	skb_queue_head_init(&local->skb_queue_unreliable);
671
672	/* init dummy netdev for use w/ NAPI */
673	init_dummy_netdev(&local->napi_dev);
674
675	ieee80211_led_names(local);
676
677	ieee80211_hw_roc_setup(local);
678
679	return local_to_hw(local);
680}
681EXPORT_SYMBOL(ieee80211_alloc_hw);
682
683int ieee80211_register_hw(struct ieee80211_hw *hw)
684{
685	struct ieee80211_local *local = hw_to_local(hw);
686	int result, i;
687	enum ieee80211_band band;
688	int channels, max_bitrates;
689	bool supp_ht;
690	static const u32 cipher_suites[] = {
691		/* keep WEP first, it may be removed below */
692		WLAN_CIPHER_SUITE_WEP40,
693		WLAN_CIPHER_SUITE_WEP104,
694		WLAN_CIPHER_SUITE_TKIP,
695		WLAN_CIPHER_SUITE_CCMP,
696
697		/* keep last -- depends on hw flags! */
698		WLAN_CIPHER_SUITE_AES_CMAC
699	};
700
701	if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
702#ifdef CONFIG_PM
703	    && (!local->ops->suspend || !local->ops->resume)
704#endif
705	    )
706		return -EINVAL;
707
708	if (hw->max_report_rates == 0)
709		hw->max_report_rates = hw->max_rates;
710
711	/*
712	 * generic code guarantees at least one band,
713	 * set this very early because much code assumes
714	 * that hw.conf.channel is assigned
715	 */
716	channels = 0;
717	max_bitrates = 0;
718	supp_ht = false;
719	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
720		struct ieee80211_supported_band *sband;
721
722		sband = local->hw.wiphy->bands[band];
723		if (!sband)
724			continue;
725		if (!local->oper_channel) {
726			/* init channel we're on */
727			local->hw.conf.channel =
728			local->oper_channel = &sband->channels[0];
729			local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
730		}
731		channels += sband->n_channels;
732
733		if (max_bitrates < sband->n_bitrates)
734			max_bitrates = sband->n_bitrates;
735		supp_ht = supp_ht || sband->ht_cap.ht_supported;
736	}
737
738	local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
739				      sizeof(void *) * channels, GFP_KERNEL);
740	if (!local->int_scan_req)
741		return -ENOMEM;
742
743	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
744		if (!local->hw.wiphy->bands[band])
745			continue;
746		local->int_scan_req->rates[band] = (u32) -1;
747	}
748
749	/* if low-level driver supports AP, we also support VLAN */
750	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
751		hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
752		hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
753	}
754
755	/* mac80211 always supports monitor */
756	hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
757	hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
758
759	/*
760	 * mac80211 doesn't support more than 1 channel, and also not more
761	 * than one IBSS interface
762	 */
763	for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
764		const struct ieee80211_iface_combination *c;
765		int j;
766
767		c = &hw->wiphy->iface_combinations[i];
768
769		if (c->num_different_channels > 1)
770			return -EINVAL;
771
772		for (j = 0; j < c->n_limits; j++)
773			if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
774			    c->limits[j].max > 1)
775				return -EINVAL;
776	}
777
778#ifndef CONFIG_MAC80211_MESH
779	/* mesh depends on Kconfig, but drivers should set it if they want */
780	local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
781#endif
782
783	/* if the underlying driver supports mesh, mac80211 will (at least)
784	 * provide routing of mesh authentication frames to userspace */
785	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
786		local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
787
788	/* mac80211 supports control port protocol changing */
789	local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
790
791	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
792		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
793	else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
794		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
795
796	WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
797	     && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
798	     "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
799
800	/*
801	 * Calculate scan IE length -- we need this to alloc
802	 * memory and to subtract from the driver limit. It
803	 * includes the DS Params, (extended) supported rates, and HT
804	 * information -- SSID is the driver's responsibility.
805	 */
806	local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
807		3 /* DS Params */;
808	if (supp_ht)
809		local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
810
811	if (!local->ops->hw_scan) {
812		/* For hw_scan, driver needs to set these up. */
813		local->hw.wiphy->max_scan_ssids = 4;
814		local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
815	}
816
817	/*
818	 * If the driver supports any scan IEs, then assume the
819	 * limit includes the IEs mac80211 will add, otherwise
820	 * leave it at zero and let the driver sort it out; we
821	 * still pass our IEs to the driver but userspace will
822	 * not be allowed to in that case.
823	 */
824	if (local->hw.wiphy->max_scan_ie_len)
825		local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
826
827	/* Set up cipher suites unless driver already did */
828	if (!local->hw.wiphy->cipher_suites) {
829		local->hw.wiphy->cipher_suites = cipher_suites;
830		local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
831		if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
832			local->hw.wiphy->n_cipher_suites--;
833	}
834	if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
835		if (local->hw.wiphy->cipher_suites == cipher_suites) {
836			local->hw.wiphy->cipher_suites += 2;
837			local->hw.wiphy->n_cipher_suites -= 2;
838		} else {
839			u32 *suites;
840			int r, w = 0;
841
842			/* Filter out WEP */
843
844			suites = kmemdup(
845				local->hw.wiphy->cipher_suites,
846				sizeof(u32) * local->hw.wiphy->n_cipher_suites,
847				GFP_KERNEL);
848			if (!suites)
849				return -ENOMEM;
850			for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
851				u32 suite = local->hw.wiphy->cipher_suites[r];
852				if (suite == WLAN_CIPHER_SUITE_WEP40 ||
853				    suite == WLAN_CIPHER_SUITE_WEP104)
854					continue;
855				suites[w++] = suite;
856			}
857			local->hw.wiphy->cipher_suites = suites;
858			local->hw.wiphy->n_cipher_suites = w;
859			local->wiphy_ciphers_allocated = true;
860		}
861	}
862
863	if (!local->ops->remain_on_channel)
864		local->hw.wiphy->max_remain_on_channel_duration = 5000;
865
866	if (local->ops->sched_scan_start)
867		local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
868
869	/* mac80211 based drivers don't support internal TDLS setup */
870	if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
871		local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
872
873	result = wiphy_register(local->hw.wiphy);
874	if (result < 0)
875		goto fail_wiphy_register;
876
877	/*
878	 * We use the number of queues for feature tests (QoS, HT) internally
879	 * so restrict them appropriately.
880	 */
881	if (hw->queues > IEEE80211_MAX_QUEUES)
882		hw->queues = IEEE80211_MAX_QUEUES;
883
884	local->workqueue =
885		alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
886	if (!local->workqueue) {
887		result = -ENOMEM;
888		goto fail_workqueue;
889	}
890
891	/*
892	 * The hardware needs headroom for sending the frame,
893	 * and we need some headroom for passing the frame to monitor
894	 * interfaces, but never both at the same time.
895	 */
896	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
897				   IEEE80211_TX_STATUS_HEADROOM);
898
899	debugfs_hw_add(local);
900
901	/*
902	 * if the driver doesn't specify a max listen interval we
903	 * use 5 which should be a safe default
904	 */
905	if (local->hw.max_listen_interval == 0)
906		local->hw.max_listen_interval = 5;
907
908	local->hw.conf.listen_interval = local->hw.max_listen_interval;
909
910	local->dynamic_ps_forced_timeout = -1;
911
912	result = ieee80211_wep_init(local);
913	if (result < 0)
914		wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
915			    result);
916
917	rtnl_lock();
918
919	result = ieee80211_init_rate_ctrl_alg(local,
920					      hw->rate_control_algorithm);
921	if (result < 0) {
922		wiphy_debug(local->hw.wiphy,
923			    "Failed to initialize rate control algorithm\n");
924		goto fail_rate;
925	}
926
927	/* add one default STA interface if supported */
928	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
929		result = ieee80211_if_add(local, "wlan%d", NULL,
930					  NL80211_IFTYPE_STATION, NULL);
931		if (result)
932			wiphy_warn(local->hw.wiphy,
933				   "Failed to add default virtual iface\n");
934	}
935
936	rtnl_unlock();
937
938	ieee80211_led_init(local);
939
940	local->network_latency_notifier.notifier_call =
941		ieee80211_max_network_latency;
942	result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
943				     &local->network_latency_notifier);
944	if (result) {
945		rtnl_lock();
946		goto fail_pm_qos;
947	}
948
949#ifdef CONFIG_INET
950	local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
951	result = register_inetaddr_notifier(&local->ifa_notifier);
952	if (result)
953		goto fail_ifa;
954#endif
955
956	netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
957			local->hw.napi_weight);
958
959	return 0;
960
961#ifdef CONFIG_INET
962 fail_ifa:
963	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
964			       &local->network_latency_notifier);
965	rtnl_lock();
966#endif
967 fail_pm_qos:
968	ieee80211_led_exit(local);
969	ieee80211_remove_interfaces(local);
970 fail_rate:
971	rtnl_unlock();
972	ieee80211_wep_free(local);
973	sta_info_stop(local);
974	destroy_workqueue(local->workqueue);
975 fail_workqueue:
976	wiphy_unregister(local->hw.wiphy);
977 fail_wiphy_register:
978	if (local->wiphy_ciphers_allocated)
979		kfree(local->hw.wiphy->cipher_suites);
980	kfree(local->int_scan_req);
981	return result;
982}
983EXPORT_SYMBOL(ieee80211_register_hw);
984
985void ieee80211_unregister_hw(struct ieee80211_hw *hw)
986{
987	struct ieee80211_local *local = hw_to_local(hw);
988
989	tasklet_kill(&local->tx_pending_tasklet);
990	tasklet_kill(&local->tasklet);
991
992	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
993			       &local->network_latency_notifier);
994#ifdef CONFIG_INET
995	unregister_inetaddr_notifier(&local->ifa_notifier);
996#endif
997
998	rtnl_lock();
999
1000	/*
1001	 * At this point, interface list manipulations are fine
1002	 * because the driver cannot be handing us frames any
1003	 * more and the tasklet is killed.
1004	 */
1005	ieee80211_remove_interfaces(local);
1006
1007	rtnl_unlock();
1008
1009	/*
1010	 * Now all work items will be gone, but the
1011	 * timer might still be armed, so delete it
1012	 */
1013	del_timer_sync(&local->work_timer);
1014
1015	cancel_work_sync(&local->restart_work);
1016	cancel_work_sync(&local->reconfig_filter);
1017
1018	ieee80211_clear_tx_pending(local);
1019	rate_control_deinitialize(local);
1020
1021	if (skb_queue_len(&local->skb_queue) ||
1022	    skb_queue_len(&local->skb_queue_unreliable))
1023		wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1024	skb_queue_purge(&local->skb_queue);
1025	skb_queue_purge(&local->skb_queue_unreliable);
1026	skb_queue_purge(&local->rx_skb_queue);
1027
1028	destroy_workqueue(local->workqueue);
1029	wiphy_unregister(local->hw.wiphy);
1030	sta_info_stop(local);
1031	ieee80211_wep_free(local);
1032	ieee80211_led_exit(local);
1033	kfree(local->int_scan_req);
1034}
1035EXPORT_SYMBOL(ieee80211_unregister_hw);
1036
1037static int ieee80211_free_ack_frame(int id, void *p, void *data)
1038{
1039	WARN_ONCE(1, "Have pending ack frames!\n");
1040	kfree_skb(p);
1041	return 0;
1042}
1043
1044void ieee80211_free_hw(struct ieee80211_hw *hw)
1045{
1046	struct ieee80211_local *local = hw_to_local(hw);
1047
1048	mutex_destroy(&local->iflist_mtx);
1049	mutex_destroy(&local->mtx);
1050
1051	if (local->wiphy_ciphers_allocated)
1052		kfree(local->hw.wiphy->cipher_suites);
1053
1054	idr_for_each(&local->ack_status_frames,
1055		     ieee80211_free_ack_frame, NULL);
1056	idr_destroy(&local->ack_status_frames);
1057
1058	wiphy_free(local->hw.wiphy);
1059}
1060EXPORT_SYMBOL(ieee80211_free_hw);
1061
1062static int __init ieee80211_init(void)
1063{
1064	struct sk_buff *skb;
1065	int ret;
1066
1067	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1068	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1069		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1070
1071	ret = rc80211_minstrel_init();
1072	if (ret)
1073		return ret;
1074
1075	ret = rc80211_minstrel_ht_init();
1076	if (ret)
1077		goto err_minstrel;
1078
1079	ret = rc80211_pid_init();
1080	if (ret)
1081		goto err_pid;
1082
1083	ret = ieee80211_iface_init();
1084	if (ret)
1085		goto err_netdev;
1086
1087	return 0;
1088 err_netdev:
1089	rc80211_pid_exit();
1090 err_pid:
1091	rc80211_minstrel_ht_exit();
1092 err_minstrel:
1093	rc80211_minstrel_exit();
1094
1095	return ret;
1096}
1097
1098static void __exit ieee80211_exit(void)
1099{
1100	rc80211_pid_exit();
1101	rc80211_minstrel_ht_exit();
1102	rc80211_minstrel_exit();
1103
1104	if (mesh_allocated)
1105		ieee80211s_stop();
1106
1107	ieee80211_iface_exit();
1108
1109	rcu_barrier();
1110}
1111
1112
1113subsys_initcall(ieee80211_init);
1114module_exit(ieee80211_exit);
1115
1116MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1117MODULE_LICENSE("GPL");
1118