[deliverable/linux.git] / net / wireless / core.c

/*
 * This is the linux wireless configuration interface.
 *
 * Copyright 2006-2008		Johannes Berg <johannes@sipsolutions.net>
 */

#include <linux/if.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/nl80211.h>
#include <linux/debugfs.h>
#include <linux/notifier.h>
#include <linux/device.h>
#include <net/genetlink.h>
#include <net/cfg80211.h>
#include <net/wireless.h>
#include "nl80211.h"
#include "core.h"
#include "sysfs.h"

/* name for sysfs, %d is appended */
#define PHY_NAME "phy"

MODULE_AUTHOR("Johannes Berg");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("wireless configuration support");

/* RCU might be appropriate here since we usually
 * only read the list, and that can happen quite
 * often because we need to do it for each command */
LIST_HEAD(cfg80211_drv_list);
DEFINE_MUTEX(cfg80211_drv_mutex);

/* for debugfs */
static struct dentry *ieee80211_debugfs_dir;

/* requires cfg80211_drv_mutex to be held! */
static struct cfg80211_registered_device *cfg80211_drv_by_wiphy(int wiphy)
{
	struct cfg80211_registered_device *result = NULL, *drv;

	list_for_each_entry(drv, &cfg80211_drv_list, list) {
		if (drv->idx == wiphy) {
			result = drv;
			break;
		}
	}

	return result;
}

/* requires cfg80211_drv_mutex to be held! */
static struct cfg80211_registered_device *
__cfg80211_drv_from_info(struct genl_info *info)
{
	int ifindex;
	struct cfg80211_registered_device *bywiphy = NULL, *byifidx = NULL;
	struct net_device *dev;
	int err = -EINVAL;

	if (info->attrs[NL80211_ATTR_WIPHY]) {
		bywiphy = cfg80211_drv_by_wiphy(
				nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
		err = -ENODEV;
	}

	if (info->attrs[NL80211_ATTR_IFINDEX]) {
		ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
		dev = dev_get_by_index(&init_net, ifindex);
		if (dev) {
			if (dev->ieee80211_ptr)
				byifidx =
					wiphy_to_dev(dev->ieee80211_ptr->wiphy);
			dev_put(dev);
		}
		err = -ENODEV;
	}

	if (bywiphy && byifidx) {
		if (bywiphy != byifidx)
			return ERR_PTR(-EINVAL);
		else
			return bywiphy; /* == byifidx */
	}
	if (bywiphy)
		return bywiphy;

	if (byifidx)
		return byifidx;

	return ERR_PTR(err);
}

struct cfg80211_registered_device *
cfg80211_get_dev_from_info(struct genl_info *info)
{
	struct cfg80211_registered_device *drv;

	mutex_lock(&cfg80211_drv_mutex);
	drv = __cfg80211_drv_from_info(info);

	/* if it is not an error we grab the lock on
	 * it to assure it won't be going away while
	 * we operate on it */
	if (!IS_ERR(drv))
		mutex_lock(&drv->mtx);

	mutex_unlock(&cfg80211_drv_mutex);

	return drv;
}

struct cfg80211_registered_device *
cfg80211_get_dev_from_ifindex(int ifindex)
{
	struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV);
	struct net_device *dev;

	mutex_lock(&cfg80211_drv_mutex);
	dev = dev_get_by_index(&init_net, ifindex);
	if (!dev)
		goto out;
	if (dev->ieee80211_ptr) {
		drv = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
		mutex_lock(&drv->mtx);
	} else
		drv = ERR_PTR(-ENODEV);
	dev_put(dev);
 out:
	mutex_unlock(&cfg80211_drv_mutex);
	return drv;
}

void cfg80211_put_dev(struct cfg80211_registered_device *drv)
{
	BUG_ON(IS_ERR(drv));
	mutex_unlock(&drv->mtx);
}

int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
			char *newname)
{
	struct cfg80211_registered_device *drv;
	int idx, taken = -1, result, digits;

	mutex_lock(&cfg80211_drv_mutex);

	/* prohibit calling the thing phy%d when %d is not its number */
	sscanf(newname, PHY_NAME "%d%n", &idx, &taken);
	if (taken == strlen(newname) && idx != rdev->idx) {
		/* count number of places needed to print idx */
		digits = 1;
		while (idx /= 10)
			digits++;
		/*
		 * deny the name if it is phy<idx> where <idx> is printed
		 * without leading zeroes. taken == strlen(newname) here
		 */
		result = -EINVAL;
		if (taken == strlen(PHY_NAME) + digits)
			goto out_unlock;
	}


	/* Ignore nop renames */
	result = 0;
	if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
		goto out_unlock;

	/* Ensure another device does not already have this name. */
	list_for_each_entry(drv, &cfg80211_drv_list, list) {
		result = -EINVAL;
		if (strcmp(newname, dev_name(&drv->wiphy.dev)) == 0)
			goto out_unlock;
	}

	/* this will only check for collisions in sysfs
	 * which is not even always compiled in.
	 */
	result = device_rename(&rdev->wiphy.dev, newname);
	if (result)
		goto out_unlock;

	if (rdev->wiphy.debugfsdir &&
	    !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
			    rdev->wiphy.debugfsdir,
			    rdev->wiphy.debugfsdir->d_parent,
			    newname))
		printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
		       newname);

	result = 0;
out_unlock:
	mutex_unlock(&cfg80211_drv_mutex);
	if (result == 0)
		nl80211_notify_dev_rename(rdev);

	return result;
}

/* exported functions */

struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv)
{
	static int wiphy_counter;

	struct cfg80211_registered_device *drv;
	int alloc_size;

	WARN_ON(!ops->add_key && ops->del_key);
	WARN_ON(ops->add_key && !ops->del_key);

	alloc_size = sizeof(*drv) + sizeof_priv;

	drv = kzalloc(alloc_size, GFP_KERNEL);
	if (!drv)
		return NULL;

	drv->ops = ops;

	mutex_lock(&cfg80211_drv_mutex);

	drv->idx = wiphy_counter++;

	if (unlikely(drv->idx < 0)) {
		wiphy_counter--;
		mutex_unlock(&cfg80211_drv_mutex);
		/* ugh, wrapped! */
		kfree(drv);
		return NULL;
	}

	mutex_unlock(&cfg80211_drv_mutex);

	/* give it a proper name */
	dev_set_name(&drv->wiphy.dev, PHY_NAME "%d", drv->idx);

	mutex_init(&drv->mtx);
	mutex_init(&drv->devlist_mtx);
	INIT_LIST_HEAD(&drv->netdev_list);

	device_initialize(&drv->wiphy.dev);
	drv->wiphy.dev.class = &ieee80211_class;
	drv->wiphy.dev.platform_data = drv;

	return &drv->wiphy;
}
EXPORT_SYMBOL(wiphy_new);

int wiphy_register(struct wiphy *wiphy)
{
	struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
	int res;
	enum ieee80211_band band;
	struct ieee80211_supported_band *sband;
	bool have_band = false;
	int i;
	u16 ifmodes = wiphy->interface_modes;

	/* sanity check ifmodes */
	WARN_ON(!ifmodes);
	ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
	if (WARN_ON(ifmodes != wiphy->interface_modes))
		wiphy->interface_modes = ifmodes;

	/* sanity check supported bands/channels */
	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
		sband = wiphy->bands[band];
		if (!sband)
			continue;

		sband->band = band;

		if (WARN_ON(!sband->n_channels || !sband->n_bitrates))
			return -EINVAL;

		/*
		 * Since we use a u32 for rate bitmaps in
		 * ieee80211_get_response_rate, we cannot
		 * have more than 32 legacy rates.
		 */
		if (WARN_ON(sband->n_bitrates > 32))
			return -EINVAL;

		for (i = 0; i < sband->n_channels; i++) {
			sband->channels[i].orig_flags =
				sband->channels[i].flags;
			sband->channels[i].orig_mag =
				sband->channels[i].max_antenna_gain;
			sband->channels[i].orig_mpwr =
				sband->channels[i].max_power;
			sband->channels[i].band = band;
		}

		have_band = true;
	}

	if (!have_band) {
		WARN_ON(1);
		return -EINVAL;
	}

	/* check and set up bitrates */
	ieee80211_set_bitrate_flags(wiphy);

	mutex_lock(&cfg80211_drv_mutex);

	/* set up regulatory info */
	wiphy_update_regulatory(wiphy, REGDOM_SET_BY_CORE);

	res = device_add(&drv->wiphy.dev);
	if (res)
		goto out_unlock;

	list_add(&drv->list, &cfg80211_drv_list);

	/* add to debugfs */
	drv->wiphy.debugfsdir =
		debugfs_create_dir(wiphy_name(&drv->wiphy),
				   ieee80211_debugfs_dir);
	if (IS_ERR(drv->wiphy.debugfsdir))
		drv->wiphy.debugfsdir = NULL;

	res = 0;
out_unlock:
	mutex_unlock(&cfg80211_drv_mutex);
	return res;
}
EXPORT_SYMBOL(wiphy_register);

void wiphy_unregister(struct wiphy *wiphy)
{
	struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);

	/* protect the device list */
	mutex_lock(&cfg80211_drv_mutex);

	BUG_ON(!list_empty(&drv->netdev_list));

	/*
	 * Try to grab drv->mtx. If a command is still in progress,
	 * hopefully the driver will refuse it since it's tearing
	 * down the device already. We wait for this command to complete
	 * before unlinking the item from the list.
	 * Note: as codified by the BUG_ON above we cannot get here if
	 * a virtual interface is still associated. Hence, we can only
	 * get to lock contention here if userspace issues a command
	 * that identified the hardware by wiphy index.
	 */
	mutex_lock(&drv->mtx);
	/* unlock again before freeing */
	mutex_unlock(&drv->mtx);

	/* If this device got a regulatory hint tell core its
	 * free to listen now to a new shiny device regulatory hint */
	reg_device_remove(wiphy);

	list_del(&drv->list);
	device_del(&drv->wiphy.dev);
	debugfs_remove(drv->wiphy.debugfsdir);

	mutex_unlock(&cfg80211_drv_mutex);
}
EXPORT_SYMBOL(wiphy_unregister);

void cfg80211_dev_free(struct cfg80211_registered_device *drv)
{
	mutex_destroy(&drv->mtx);
	mutex_destroy(&drv->devlist_mtx);
	kfree(drv);
}

void wiphy_free(struct wiphy *wiphy)
{
	put_device(&wiphy->dev);
}
EXPORT_SYMBOL(wiphy_free);

static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
					 unsigned long state,
					 void *ndev)
{
	struct net_device *dev = ndev;
	struct cfg80211_registered_device *rdev;

	if (!dev->ieee80211_ptr)
		return 0;

	rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);

	WARN_ON(dev->ieee80211_ptr->iftype == NL80211_IFTYPE_UNSPECIFIED);

	switch (state) {
	case NETDEV_REGISTER:
		mutex_lock(&rdev->devlist_mtx);
		list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list);
		if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
				      "phy80211")) {
			printk(KERN_ERR "wireless: failed to add phy80211 "
				"symlink to netdev!\n");
		}
		dev->ieee80211_ptr->netdev = dev;
		mutex_unlock(&rdev->devlist_mtx);
		break;
	case NETDEV_UNREGISTER:
		mutex_lock(&rdev->devlist_mtx);
		if (!list_empty(&dev->ieee80211_ptr->list)) {
			sysfs_remove_link(&dev->dev.kobj, "phy80211");
			list_del_init(&dev->ieee80211_ptr->list);
		}
		mutex_unlock(&rdev->devlist_mtx);
		break;
	}

	return 0;
}

static struct notifier_block cfg80211_netdev_notifier = {
	.notifier_call = cfg80211_netdev_notifier_call,
};

static int cfg80211_init(void)
{
	int err;

	err = wiphy_sysfs_init();
	if (err)
		goto out_fail_sysfs;

	err = register_netdevice_notifier(&cfg80211_netdev_notifier);
	if (err)
		goto out_fail_notifier;

	err = nl80211_init();
	if (err)
		goto out_fail_nl80211;

	ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);

	err = regulatory_init();
	if (err)
		goto out_fail_reg;

	return 0;

out_fail_reg:
	debugfs_remove(ieee80211_debugfs_dir);
out_fail_nl80211:
	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
out_fail_notifier:
	wiphy_sysfs_exit();
out_fail_sysfs:
	return err;
}

subsys_initcall(cfg80211_init);

static void cfg80211_exit(void)
{
	debugfs_remove(ieee80211_debugfs_dir);
	nl80211_exit();
	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
	wiphy_sysfs_exit();
	regulatory_exit();
}
module_exit(cfg80211_exit);
Commit	Line	Data
704232c2 JB	1	/*
	2	* This is the linux wireless configuration interface.
	3	*
f59ac048	4	* Copyright 2006-2008 Johannes Berg <johannes@sipsolutions.net>
704232c2 JB	5	*/
	6
	7	#include <linux/if.h>
	8	#include <linux/module.h>
	9	#include <linux/err.h>
	10	#include <linux/mutex.h>
	11	#include <linux/list.h>
	12	#include <linux/nl80211.h>
	13	#include <linux/debugfs.h>
	14	#include <linux/notifier.h>
	15	#include <linux/device.h>
	16	#include <net/genetlink.h>
	17	#include <net/cfg80211.h>
	18	#include <net/wireless.h>
55682965	19	#include "nl80211.h"
704232c2 JB	20	#include "core.h"
	21	#include "sysfs.h"
	22
	23	/* name for sysfs, %d is appended */
	24	#define PHY_NAME "phy"
	25
	26	MODULE_AUTHOR("Johannes Berg");
	27	MODULE_LICENSE("GPL");
	28	MODULE_DESCRIPTION("wireless configuration support");
	29
	30	/* RCU might be appropriate here since we usually
	31	* only read the list, and that can happen quite
	32	* often because we need to do it for each command */
	33	LIST_HEAD(cfg80211_drv_list);
	34	DEFINE_MUTEX(cfg80211_drv_mutex);
704232c2 JB	35
	36	/* for debugfs */
	37	static struct dentry *ieee80211_debugfs_dir;
	38
55682965 JB	39	/* requires cfg80211_drv_mutex to be held! */
	40	static struct cfg80211_registered_device *cfg80211_drv_by_wiphy(int wiphy)
	41	{
	42	struct cfg80211_registered_device result = NULL, drv;
	43
	44	list_for_each_entry(drv, &cfg80211_drv_list, list) {
	45	if (drv->idx == wiphy) {
	46	result = drv;
	47	break;
	48	}
	49	}
	50
	51	return result;
	52	}
	53
	54	/* requires cfg80211_drv_mutex to be held! */
	55	static struct cfg80211_registered_device *
	56	__cfg80211_drv_from_info(struct genl_info *info)
	57	{
	58	int ifindex;
	59	struct cfg80211_registered_device bywiphy = NULL, byifidx = NULL;
	60	struct net_device *dev;
	61	int err = -EINVAL;
	62
	63	if (info->attrs[NL80211_ATTR_WIPHY]) {
	64	bywiphy = cfg80211_drv_by_wiphy(
	65	nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
	66	err = -ENODEV;
	67	}
	68
	69	if (info->attrs[NL80211_ATTR_IFINDEX]) {
	70	ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
	71	dev = dev_get_by_index(&init_net, ifindex);
	72	if (dev) {
	73	if (dev->ieee80211_ptr)
	74	byifidx =
	75	wiphy_to_dev(dev->ieee80211_ptr->wiphy);
	76	dev_put(dev);
	77	}
	78	err = -ENODEV;
	79	}
	80
	81	if (bywiphy && byifidx) {
	82	if (bywiphy != byifidx)
	83	return ERR_PTR(-EINVAL);
	84	else
	85	return bywiphy; /* == byifidx */
	86	}
	87	if (bywiphy)
	88	return bywiphy;
	89
	90	if (byifidx)
	91	return byifidx;
	92
	93	return ERR_PTR(err);
	94	}
	95
	96	struct cfg80211_registered_device *
	97	cfg80211_get_dev_from_info(struct genl_info *info)
	98	{
	99	struct cfg80211_registered_device *drv;
	100
	101	mutex_lock(&cfg80211_drv_mutex);
	102	drv = __cfg80211_drv_from_info(info);
103
104	/* if it is not an error we grab the lock on
105	* it to assure it won't be going away while
106	* we operate on it */
107	if (!IS_ERR(drv))
108	mutex_lock(&drv->mtx);
109
110	mutex_unlock(&cfg80211_drv_mutex);
111
112	return drv;
113	}
114
115	struct cfg80211_registered_device *
116	cfg80211_get_dev_from_ifindex(int ifindex)
117	{
118	struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV);
119	struct net_device *dev;
120
121	mutex_lock(&cfg80211_drv_mutex);
122	dev = dev_get_by_index(&init_net, ifindex);
123	if (!dev)
124	goto out;
125	if (dev->ieee80211_ptr) {
126	drv = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
127	mutex_lock(&drv->mtx);
128	} else
129	drv = ERR_PTR(-ENODEV);
130	dev_put(dev);
131	out:
132	mutex_unlock(&cfg80211_drv_mutex);
133	return drv;
134	}
135
136	void cfg80211_put_dev(struct cfg80211_registered_device *drv)
137	{
138	BUG_ON(IS_ERR(drv));
139	mutex_unlock(&drv->mtx);
140	}
141
142	int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
143	char *newname)
144	{
2940bb69	145	struct cfg80211_registered_device *drv;
55682965 JB	146	int idx, taken = -1, result, digits;
55682965 JB	147
2940bb69 EB	148	mutex_lock(&cfg80211_drv_mutex);
2940bb69 EB	149
55682965 JB	150	/* prohibit calling the thing phy%d when %d is not its number */
	151	sscanf(newname, PHY_NAME "%d%n", &idx, &taken);
	152	if (taken == strlen(newname) && idx != rdev->idx) {
	153	/* count number of places needed to print idx */
	154	digits = 1;
	155	while (idx /= 10)
	156	digits++;
	157	/*
	158	* deny the name if it is phy<idx> where <idx> is printed
	159	* without leading zeroes. taken == strlen(newname) here
	160	*/
2940bb69	161	result = -EINVAL;
55682965	162	if (taken == strlen(PHY_NAME) + digits)
2940bb69 EB	163	goto out_unlock;
	164	}
	165
	166
	167	/* Ignore nop renames */
	168	result = 0;
	169	if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
	170	goto out_unlock;
	171
	172	/* Ensure another device does not already have this name. */
	173	list_for_each_entry(drv, &cfg80211_drv_list, list) {
	174	result = -EINVAL;
	175	if (strcmp(newname, dev_name(&drv->wiphy.dev)) == 0)
	176	goto out_unlock;
55682965 JB	177	}
55682965 JB	178
2940bb69 EB	179	/* this will only check for collisions in sysfs
	180	* which is not even always compiled in.
	181	*/
55682965 JB	182	result = device_rename(&rdev->wiphy.dev, newname);
55682965 JB	183	if (result)
2940bb69	184	goto out_unlock;
55682965	185
33c0360b JB	186	if (rdev->wiphy.debugfsdir &&
33c0360b JB	187	!debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
55682965 JB	188	rdev->wiphy.debugfsdir,
	189	rdev->wiphy.debugfsdir->d_parent,
	190	newname))
	191	printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
	192	newname);
	193
2940bb69 EB	194	result = 0;
	195	out_unlock:
	196	mutex_unlock(&cfg80211_drv_mutex);
	197	if (result == 0)
	198	nl80211_notify_dev_rename(rdev);
55682965	199
2940bb69	200	return result;
55682965 JB	201	}
55682965 JB	202
704232c2 JB	203	/* exported functions */
	204
	205	struct wiphy wiphy_new(struct cfg80211_ops ops, int sizeof_priv)
	206	{
638af073 DC	207	static int wiphy_counter;
638af073 DC	208
704232c2 JB	209	struct cfg80211_registered_device *drv;
	210	int alloc_size;
	211
41ade00f JB	212	WARN_ON(!ops->add_key && ops->del_key);
	213	WARN_ON(ops->add_key && !ops->del_key);
	214
704232c2 JB	215	alloc_size = sizeof(*drv) + sizeof_priv;
	216
	217	drv = kzalloc(alloc_size, GFP_KERNEL);
	218	if (!drv)
	219	return NULL;
	220
	221	drv->ops = ops;
	222
	223	mutex_lock(&cfg80211_drv_mutex);
	224
638af073	225	drv->idx = wiphy_counter++;
a4d73ee1 JB	226
a4d73ee1 JB	227	if (unlikely(drv->idx < 0)) {
638af073 DC	228	wiphy_counter--;
638af073 DC	229	mutex_unlock(&cfg80211_drv_mutex);
704232c2 JB	230	/* ugh, wrapped! */
	231	kfree(drv);
	232	return NULL;
	233	}
704232c2	234
638af073 DC	235	mutex_unlock(&cfg80211_drv_mutex);
638af073 DC	236
704232c2	237	/* give it a proper name */
fb28ad35	238	dev_set_name(&drv->wiphy.dev, PHY_NAME "%d", drv->idx);
704232c2	239
704232c2 JB	240	mutex_init(&drv->mtx);
	241	mutex_init(&drv->devlist_mtx);
	242	INIT_LIST_HEAD(&drv->netdev_list);
	243
	244	device_initialize(&drv->wiphy.dev);
	245	drv->wiphy.dev.class = &ieee80211_class;
	246	drv->wiphy.dev.platform_data = drv;
	247
	248	return &drv->wiphy;
	249	}
	250	EXPORT_SYMBOL(wiphy_new);
	251
	252	int wiphy_register(struct wiphy *wiphy)
	253	{
	254	struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
	255	int res;
8318d78a JB	256	enum ieee80211_band band;
	257	struct ieee80211_supported_band *sband;
	258	bool have_band = false;
	259	int i;
f59ac048 LR	260	u16 ifmodes = wiphy->interface_modes;
	261
	262	/* sanity check ifmodes */
	263	WARN_ON(!ifmodes);
	264	ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
	265	if (WARN_ON(ifmodes != wiphy->interface_modes))
	266	wiphy->interface_modes = ifmodes;
8318d78a JB	267
	268	/* sanity check supported bands/channels */
	269	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
	270	sband = wiphy->bands[band];
	271	if (!sband)
	272	continue;
	273
	274	sband->band = band;
	275
881d948c JB	276	if (WARN_ON(!sband->n_channels \|\| !sband->n_bitrates))
	277	return -EINVAL;
	278
	279	/*
	280	* Since we use a u32 for rate bitmaps in
	281	* ieee80211_get_response_rate, we cannot
	282	* have more than 32 legacy rates.
	283	*/
	284	if (WARN_ON(sband->n_bitrates > 32))
8318d78a	285	return -EINVAL;
8318d78a JB	286
	287	for (i = 0; i < sband->n_channels; i++) {
	288	sband->channels[i].orig_flags =
	289	sband->channels[i].flags;
	290	sband->channels[i].orig_mag =
	291	sband->channels[i].max_antenna_gain;
	292	sband->channels[i].orig_mpwr =
	293	sband->channels[i].max_power;
	294	sband->channels[i].band = band;
	295	}
	296
	297	have_band = true;
	298	}
	299
	300	if (!have_band) {
	301	WARN_ON(1);
	302	return -EINVAL;
	303	}
	304
	305	/* check and set up bitrates */
	306	ieee80211_set_bitrate_flags(wiphy);
	307
f3b407fb JB	308	mutex_lock(&cfg80211_drv_mutex);
f3b407fb JB	309
8318d78a	310	/* set up regulatory info */
b2e1b302	311	wiphy_update_regulatory(wiphy, REGDOM_SET_BY_CORE);
704232c2	312
704232c2 JB	313	res = device_add(&drv->wiphy.dev);
	314	if (res)
	315	goto out_unlock;
	316
	317	list_add(&drv->list, &cfg80211_drv_list);
	318
	319	/* add to debugfs */
	320	drv->wiphy.debugfsdir =
	321	debugfs_create_dir(wiphy_name(&drv->wiphy),
	322	ieee80211_debugfs_dir);
33c0360b JB	323	if (IS_ERR(drv->wiphy.debugfsdir))
33c0360b JB	324	drv->wiphy.debugfsdir = NULL;
704232c2 JB	325
	326	res = 0;
	327	out_unlock:
	328	mutex_unlock(&cfg80211_drv_mutex);
	329	return res;
	330	}
	331	EXPORT_SYMBOL(wiphy_register);
	332
	333	void wiphy_unregister(struct wiphy *wiphy)
	334	{
	335	struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
	336
f16bfc1c	337	/* protect the device list */
704232c2 JB	338	mutex_lock(&cfg80211_drv_mutex);
704232c2 JB	339
f16bfc1c JB	340	BUG_ON(!list_empty(&drv->netdev_list));
	341
	342	/*
	343	* Try to grab drv->mtx. If a command is still in progress,
	344	* hopefully the driver will refuse it since it's tearing
	345	* down the device already. We wait for this command to complete
	346	* before unlinking the item from the list.
	347	* Note: as codified by the BUG_ON above we cannot get here if
	348	* a virtual interface is still associated. Hence, we can only
	349	* get to lock contention here if userspace issues a command
	350	* that identified the hardware by wiphy index.
	351	*/
704232c2	352	mutex_lock(&drv->mtx);
f16bfc1c	353	/* unlock again before freeing */
704232c2 JB	354	mutex_unlock(&drv->mtx);
704232c2 JB	355
3f2355cb LR	356	/* If this device got a regulatory hint tell core its
	357	* free to listen now to a new shiny device regulatory hint */
	358	reg_device_remove(wiphy);
	359
f16bfc1c	360	list_del(&drv->list);
704232c2 JB	361	device_del(&drv->wiphy.dev);
	362	debugfs_remove(drv->wiphy.debugfsdir);
	363
	364	mutex_unlock(&cfg80211_drv_mutex);
	365	}
	366	EXPORT_SYMBOL(wiphy_unregister);
	367
	368	void cfg80211_dev_free(struct cfg80211_registered_device *drv)
	369	{
	370	mutex_destroy(&drv->mtx);
	371	mutex_destroy(&drv->devlist_mtx);
	372	kfree(drv);
	373	}
	374
	375	void wiphy_free(struct wiphy *wiphy)
	376	{
	377	put_device(&wiphy->dev);
	378	}
	379	EXPORT_SYMBOL(wiphy_free);
	380
	381	static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
	382	unsigned long state,
	383	void *ndev)
	384	{
	385	struct net_device *dev = ndev;
	386	struct cfg80211_registered_device *rdev;
	387
	388	if (!dev->ieee80211_ptr)
	389	return 0;
	390
	391	rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
	392
60719ffd JB	393	WARN_ON(dev->ieee80211_ptr->iftype == NL80211_IFTYPE_UNSPECIFIED);
60719ffd JB	394
704232c2 JB	395	switch (state) {
	396	case NETDEV_REGISTER:
	397	mutex_lock(&rdev->devlist_mtx);
	398	list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list);
	399	if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
	400	"phy80211")) {
	401	printk(KERN_ERR "wireless: failed to add phy80211 "
	402	"symlink to netdev!\n");
	403	}
	404	dev->ieee80211_ptr->netdev = dev;
	405	mutex_unlock(&rdev->devlist_mtx);
	406	break;
	407	case NETDEV_UNREGISTER:
	408	mutex_lock(&rdev->devlist_mtx);
	409	if (!list_empty(&dev->ieee80211_ptr->list)) {
	410	sysfs_remove_link(&dev->dev.kobj, "phy80211");
	411	list_del_init(&dev->ieee80211_ptr->list);
	412	}
	413	mutex_unlock(&rdev->devlist_mtx);
	414	break;
	415	}
	416
	417	return 0;
	418	}
	419
	420	static struct notifier_block cfg80211_netdev_notifier = {
	421	.notifier_call = cfg80211_netdev_notifier_call,
	422	};
	423
	424	static int cfg80211_init(void)
	425	{
b2e1b302 LR	426	int err;
b2e1b302 LR	427
b2e1b302	428	err = wiphy_sysfs_init();
704232c2 JB	429	if (err)
	430	goto out_fail_sysfs;
	431
	432	err = register_netdevice_notifier(&cfg80211_netdev_notifier);
	433	if (err)
	434	goto out_fail_notifier;
	435
55682965 JB	436	err = nl80211_init();
	437	if (err)
	438	goto out_fail_nl80211;
	439
704232c2 JB	440	ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
704232c2 JB	441
b2e1b302 LR	442	err = regulatory_init();
	443	if (err)
	444	goto out_fail_reg;
	445
704232c2 JB	446	return 0;
704232c2 JB	447
b2e1b302 LR	448	out_fail_reg:
b2e1b302 LR	449	debugfs_remove(ieee80211_debugfs_dir);
55682965 JB	450	out_fail_nl80211:
55682965 JB	451	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
704232c2 JB	452	out_fail_notifier:
	453	wiphy_sysfs_exit();
	454	out_fail_sysfs:
	455	return err;
	456	}
b2e1b302	457
3a462465	458	subsys_initcall(cfg80211_init);
704232c2 JB	459
	460	static void cfg80211_exit(void)
	461	{
	462	debugfs_remove(ieee80211_debugfs_dir);
55682965	463	nl80211_exit();
704232c2 JB	464	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
704232c2 JB	465	wiphy_sysfs_exit();
b2e1b302	466	regulatory_exit();
704232c2 JB	467	}
704232c2 JB	468	module_exit(cfg80211_exit);