[mirror_ubuntu-bionic-kernel.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_idx(int wiphy_idx)
{
	struct cfg80211_registered_device *result = NULL, *drv;

	list_for_each_entry(drv, &cfg80211_drv_list, list) {
		if (drv->wiphy_idx == wiphy_idx) {
			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 *bywiphyidx = NULL, *byifidx = NULL;
	struct net_device *dev;
	int err = -EINVAL;

	if (info->attrs[NL80211_ATTR_WIPHY]) {
		bywiphyidx = cfg80211_drv_by_wiphy_idx(
				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 (bywiphyidx && byifidx) {
		if (bywiphyidx != byifidx)
			return ERR_PTR(-EINVAL);
		else
			return bywiphyidx; /* == byifidx */
	}
	if (bywiphyidx)
		return bywiphyidx;

	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 wiphy_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", &wiphy_idx, &taken);
	if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
		/* count number of places needed to print wiphy_idx */
		digits = 1;
		while (wiphy_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->wiphy_idx = wiphy_counter++;

	if (unlikely(drv->wiphy_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->wiphy_idx);

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

	if (WARN_ON(wiphy->max_scan_ssids < 1))
		return -EINVAL;

	/* 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)
{
	struct cfg80211_internal_bss *scan, *tmp;
	mutex_destroy(&drv->mtx);
	mutex_destroy(&drv->devlist_mtx);
	list_for_each_entry_safe(scan, tmp, &drv->bss_list, list)
		cfg80211_put_bss(&scan->pub);
	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	39	/* requires cfg80211_drv_mutex to be held! */
b5850a7a LR	40	static struct cfg80211_registered_device *
b5850a7a LR	41	cfg80211_drv_by_wiphy_idx(int wiphy_idx)
55682965 JB	42	{
	43	struct cfg80211_registered_device result = NULL, drv;
	44
	45	list_for_each_entry(drv, &cfg80211_drv_list, list) {
b5850a7a	46	if (drv->wiphy_idx == wiphy_idx) {
55682965 JB	47	result = drv;
	48	break;
	49	}
	50	}
	51
	52	return result;
	53	}
	54
	55	/* requires cfg80211_drv_mutex to be held! */
	56	static struct cfg80211_registered_device *
	57	__cfg80211_drv_from_info(struct genl_info *info)
	58	{
	59	int ifindex;
b5850a7a	60	struct cfg80211_registered_device bywiphyidx = NULL, byifidx = NULL;
55682965 JB	61	struct net_device *dev;
	62	int err = -EINVAL;
	63
	64	if (info->attrs[NL80211_ATTR_WIPHY]) {
b5850a7a	65	bywiphyidx = cfg80211_drv_by_wiphy_idx(
55682965 JB	66	nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
	67	err = -ENODEV;
	68	}
	69
	70	if (info->attrs[NL80211_ATTR_IFINDEX]) {
	71	ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
	72	dev = dev_get_by_index(&init_net, ifindex);
	73	if (dev) {
	74	if (dev->ieee80211_ptr)
	75	byifidx =
	76	wiphy_to_dev(dev->ieee80211_ptr->wiphy);
	77	dev_put(dev);
	78	}
	79	err = -ENODEV;
	80	}
	81
b5850a7a LR	82	if (bywiphyidx && byifidx) {
b5850a7a LR	83	if (bywiphyidx != byifidx)
55682965 JB	84	return ERR_PTR(-EINVAL);
55682965 JB	85	else
b5850a7a	86	return bywiphyidx; /* == byifidx */
55682965	87	}
b5850a7a LR	88	if (bywiphyidx)
b5850a7a LR	89	return bywiphyidx;
55682965 JB	90
	91	if (byifidx)
	92	return byifidx;
	93
	94	return ERR_PTR(err);
	95	}
	96
	97	struct cfg80211_registered_device *
	98	cfg80211_get_dev_from_info(struct genl_info *info)
	99	{
	100	struct cfg80211_registered_device *drv;
	101
	102	mutex_lock(&cfg80211_drv_mutex);
	103	drv = __cfg80211_drv_from_info(info);
	104
	105	/* if it is not an error we grab the lock on
	106	* it to assure it won't be going away while
	107	* we operate on it */
	108	if (!IS_ERR(drv))
	109	mutex_lock(&drv->mtx);
	110
	111	mutex_unlock(&cfg80211_drv_mutex);
	112
	113	return drv;
	114	}
	115
	116	struct cfg80211_registered_device *
	117	cfg80211_get_dev_from_ifindex(int ifindex)
	118	{
	119	struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV);
	120	struct net_device *dev;
	121
	122	mutex_lock(&cfg80211_drv_mutex);
	123	dev = dev_get_by_index(&init_net, ifindex);
	124	if (!dev)
	125	goto out;
	126	if (dev->ieee80211_ptr) {
	127	drv = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
	128	mutex_lock(&drv->mtx);
	129	} else
	130	drv = ERR_PTR(-ENODEV);
	131	dev_put(dev);
	132	out:
	133	mutex_unlock(&cfg80211_drv_mutex);
	134	return drv;
	135	}
	136
	137	void cfg80211_put_dev(struct cfg80211_registered_device *drv)
	138	{
	139	BUG_ON(IS_ERR(drv));
	140	mutex_unlock(&drv->mtx);
	141	}
	142
	143	int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
	144	char *newname)
	145	{
2940bb69	146	struct cfg80211_registered_device *drv;
b5850a7a	147	int wiphy_idx, taken = -1, result, digits;
55682965	148
2940bb69 EB	149	mutex_lock(&cfg80211_drv_mutex);
2940bb69 EB	150
55682965	151	/* prohibit calling the thing phy%d when %d is not its number */
b5850a7a LR	152	sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
	153	if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
	154	/* count number of places needed to print wiphy_idx */
55682965	155	digits = 1;
b5850a7a	156	while (wiphy_idx /= 10)
55682965 JB	157	digits++;
	158	/*
	159	* deny the name if it is phy<idx> where <idx> is printed
	160	* without leading zeroes. taken == strlen(newname) here
	161	*/
2940bb69	162	result = -EINVAL;
55682965	163	if (taken == strlen(PHY_NAME) + digits)
2940bb69 EB	164	goto out_unlock;
	165	}
	166
	167
	168	/* Ignore nop renames */
	169	result = 0;
	170	if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
	171	goto out_unlock;
	172
	173	/* Ensure another device does not already have this name. */
	174	list_for_each_entry(drv, &cfg80211_drv_list, list) {
	175	result = -EINVAL;
	176	if (strcmp(newname, dev_name(&drv->wiphy.dev)) == 0)
	177	goto out_unlock;
55682965 JB	178	}
55682965 JB	179
2940bb69 EB	180	/* this will only check for collisions in sysfs
	181	* which is not even always compiled in.
	182	*/
55682965 JB	183	result = device_rename(&rdev->wiphy.dev, newname);
55682965 JB	184	if (result)
2940bb69	185	goto out_unlock;
55682965	186
33c0360b JB	187	if (rdev->wiphy.debugfsdir &&
33c0360b JB	188	!debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
55682965 JB	189	rdev->wiphy.debugfsdir,
	190	rdev->wiphy.debugfsdir->d_parent,
	191	newname))
	192	printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
	193	newname);
	194
2940bb69 EB	195	result = 0;
	196	out_unlock:
	197	mutex_unlock(&cfg80211_drv_mutex);
	198	if (result == 0)
	199	nl80211_notify_dev_rename(rdev);
55682965	200
2940bb69	201	return result;
55682965 JB	202	}
55682965 JB	203
704232c2 JB	204	/* exported functions */
	205
	206	struct wiphy wiphy_new(struct cfg80211_ops ops, int sizeof_priv)
	207	{
638af073 DC	208	static int wiphy_counter;
638af073 DC	209
704232c2 JB	210	struct cfg80211_registered_device *drv;
	211	int alloc_size;
	212
41ade00f JB	213	WARN_ON(!ops->add_key && ops->del_key);
	214	WARN_ON(ops->add_key && !ops->del_key);
	215
704232c2 JB	216	alloc_size = sizeof(*drv) + sizeof_priv;
	217
	218	drv = kzalloc(alloc_size, GFP_KERNEL);
	219	if (!drv)
	220	return NULL;
	221
	222	drv->ops = ops;
	223
	224	mutex_lock(&cfg80211_drv_mutex);
	225
b5850a7a	226	drv->wiphy_idx = wiphy_counter++;
a4d73ee1	227
b5850a7a	228	if (unlikely(drv->wiphy_idx < 0)) {
638af073 DC	229	wiphy_counter--;
638af073 DC	230	mutex_unlock(&cfg80211_drv_mutex);
704232c2 JB	231	/* ugh, wrapped! */
	232	kfree(drv);
	233	return NULL;
	234	}
704232c2	235
638af073 DC	236	mutex_unlock(&cfg80211_drv_mutex);
638af073 DC	237
704232c2	238	/* give it a proper name */
b5850a7a	239	dev_set_name(&drv->wiphy.dev, PHY_NAME "%d", drv->wiphy_idx);
704232c2	240
704232c2 JB	241	mutex_init(&drv->mtx);
	242	mutex_init(&drv->devlist_mtx);
	243	INIT_LIST_HEAD(&drv->netdev_list);
2a519311 JB	244	spin_lock_init(&drv->bss_lock);
2a519311 JB	245	INIT_LIST_HEAD(&drv->bss_list);
704232c2 JB	246
	247	device_initialize(&drv->wiphy.dev);
	248	drv->wiphy.dev.class = &ieee80211_class;
	249	drv->wiphy.dev.platform_data = drv;
	250
	251	return &drv->wiphy;
	252	}
	253	EXPORT_SYMBOL(wiphy_new);
	254
	255	int wiphy_register(struct wiphy *wiphy)
	256	{
	257	struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
	258	int res;
8318d78a JB	259	enum ieee80211_band band;
	260	struct ieee80211_supported_band *sband;
	261	bool have_band = false;
	262	int i;
f59ac048 LR	263	u16 ifmodes = wiphy->interface_modes;
f59ac048 LR	264
2a519311 JB	265	if (WARN_ON(wiphy->max_scan_ssids < 1))
	266	return -EINVAL;
	267
f59ac048 LR	268	/* sanity check ifmodes */
	269	WARN_ON(!ifmodes);
	270	ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
	271	if (WARN_ON(ifmodes != wiphy->interface_modes))
	272	wiphy->interface_modes = ifmodes;
8318d78a JB	273
	274	/* sanity check supported bands/channels */
	275	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
	276	sband = wiphy->bands[band];
	277	if (!sband)
	278	continue;
	279
	280	sband->band = band;
	281
881d948c JB	282	if (WARN_ON(!sband->n_channels \|\| !sband->n_bitrates))
	283	return -EINVAL;
	284
	285	/*
	286	* Since we use a u32 for rate bitmaps in
	287	* ieee80211_get_response_rate, we cannot
	288	* have more than 32 legacy rates.
	289	*/
	290	if (WARN_ON(sband->n_bitrates > 32))
8318d78a	291	return -EINVAL;
8318d78a JB	292
	293	for (i = 0; i < sband->n_channels; i++) {
	294	sband->channels[i].orig_flags =
	295	sband->channels[i].flags;
	296	sband->channels[i].orig_mag =
	297	sband->channels[i].max_antenna_gain;
	298	sband->channels[i].orig_mpwr =
	299	sband->channels[i].max_power;
	300	sband->channels[i].band = band;
	301	}
	302
	303	have_band = true;
	304	}
	305
	306	if (!have_band) {
	307	WARN_ON(1);
	308	return -EINVAL;
	309	}
	310
	311	/* check and set up bitrates */
	312	ieee80211_set_bitrate_flags(wiphy);
	313
f3b407fb JB	314	mutex_lock(&cfg80211_drv_mutex);
f3b407fb JB	315
8318d78a	316	/* set up regulatory info */
b2e1b302	317	wiphy_update_regulatory(wiphy, REGDOM_SET_BY_CORE);
704232c2	318
704232c2 JB	319	res = device_add(&drv->wiphy.dev);
	320	if (res)
	321	goto out_unlock;
	322
	323	list_add(&drv->list, &cfg80211_drv_list);
	324
	325	/* add to debugfs */
	326	drv->wiphy.debugfsdir =
	327	debugfs_create_dir(wiphy_name(&drv->wiphy),
	328	ieee80211_debugfs_dir);
33c0360b JB	329	if (IS_ERR(drv->wiphy.debugfsdir))
33c0360b JB	330	drv->wiphy.debugfsdir = NULL;
704232c2 JB	331
	332	res = 0;
	333	out_unlock:
	334	mutex_unlock(&cfg80211_drv_mutex);
	335	return res;
	336	}
	337	EXPORT_SYMBOL(wiphy_register);
	338
	339	void wiphy_unregister(struct wiphy *wiphy)
	340	{
	341	struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
	342
f16bfc1c	343	/* protect the device list */
704232c2 JB	344	mutex_lock(&cfg80211_drv_mutex);
704232c2 JB	345
f16bfc1c JB	346	BUG_ON(!list_empty(&drv->netdev_list));
	347
	348	/*
	349	* Try to grab drv->mtx. If a command is still in progress,
	350	* hopefully the driver will refuse it since it's tearing
	351	* down the device already. We wait for this command to complete
	352	* before unlinking the item from the list.
	353	* Note: as codified by the BUG_ON above we cannot get here if
	354	* a virtual interface is still associated. Hence, we can only
	355	* get to lock contention here if userspace issues a command
	356	* that identified the hardware by wiphy index.
	357	*/
704232c2	358	mutex_lock(&drv->mtx);
f16bfc1c	359	/* unlock again before freeing */
704232c2 JB	360	mutex_unlock(&drv->mtx);
704232c2 JB	361
3f2355cb LR	362	/* If this device got a regulatory hint tell core its
	363	* free to listen now to a new shiny device regulatory hint */
	364	reg_device_remove(wiphy);
	365
f16bfc1c	366	list_del(&drv->list);
704232c2 JB	367	device_del(&drv->wiphy.dev);
	368	debugfs_remove(drv->wiphy.debugfsdir);
	369
	370	mutex_unlock(&cfg80211_drv_mutex);
	371	}
	372	EXPORT_SYMBOL(wiphy_unregister);
	373
	374	void cfg80211_dev_free(struct cfg80211_registered_device *drv)
	375	{
2a519311	376	struct cfg80211_internal_bss scan, tmp;
704232c2 JB	377	mutex_destroy(&drv->mtx);
704232c2 JB	378	mutex_destroy(&drv->devlist_mtx);
2a519311	379	list_for_each_entry_safe(scan, tmp, &drv->bss_list, list)
78c1c7e1	380	cfg80211_put_bss(&scan->pub);
704232c2 JB	381	kfree(drv);
	382	}
	383
	384	void wiphy_free(struct wiphy *wiphy)
	385	{
	386	put_device(&wiphy->dev);
	387	}
	388	EXPORT_SYMBOL(wiphy_free);
	389
	390	static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
	391	unsigned long state,
	392	void *ndev)
	393	{
	394	struct net_device *dev = ndev;
	395	struct cfg80211_registered_device *rdev;
	396
	397	if (!dev->ieee80211_ptr)
	398	return 0;
	399
	400	rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
	401
60719ffd JB	402	WARN_ON(dev->ieee80211_ptr->iftype == NL80211_IFTYPE_UNSPECIFIED);
60719ffd JB	403
704232c2 JB	404	switch (state) {
	405	case NETDEV_REGISTER:
	406	mutex_lock(&rdev->devlist_mtx);
	407	list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list);
	408	if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
	409	"phy80211")) {
	410	printk(KERN_ERR "wireless: failed to add phy80211 "
	411	"symlink to netdev!\n");
	412	}
	413	dev->ieee80211_ptr->netdev = dev;
	414	mutex_unlock(&rdev->devlist_mtx);
	415	break;
	416	case NETDEV_UNREGISTER:
	417	mutex_lock(&rdev->devlist_mtx);
	418	if (!list_empty(&dev->ieee80211_ptr->list)) {
	419	sysfs_remove_link(&dev->dev.kobj, "phy80211");
	420	list_del_init(&dev->ieee80211_ptr->list);
	421	}
	422	mutex_unlock(&rdev->devlist_mtx);
	423	break;
	424	}
	425
	426	return 0;
	427	}
	428
	429	static struct notifier_block cfg80211_netdev_notifier = {
	430	.notifier_call = cfg80211_netdev_notifier_call,
	431	};
	432
	433	static int cfg80211_init(void)
	434	{
b2e1b302 LR	435	int err;
b2e1b302 LR	436
b2e1b302	437	err = wiphy_sysfs_init();
704232c2 JB	438	if (err)
	439	goto out_fail_sysfs;
	440
	441	err = register_netdevice_notifier(&cfg80211_netdev_notifier);
	442	if (err)
	443	goto out_fail_notifier;
	444
55682965 JB	445	err = nl80211_init();
	446	if (err)
	447	goto out_fail_nl80211;
	448
704232c2 JB	449	ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
704232c2 JB	450
b2e1b302 LR	451	err = regulatory_init();
	452	if (err)
	453	goto out_fail_reg;
	454
704232c2 JB	455	return 0;
704232c2 JB	456
b2e1b302 LR	457	out_fail_reg:
b2e1b302 LR	458	debugfs_remove(ieee80211_debugfs_dir);
55682965 JB	459	out_fail_nl80211:
55682965 JB	460	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
704232c2 JB	461	out_fail_notifier:
	462	wiphy_sysfs_exit();
	463	out_fail_sysfs:
	464	return err;
	465	}
b2e1b302	466
3a462465	467	subsys_initcall(cfg80211_init);
704232c2 JB	468
	469	static void cfg80211_exit(void)
	470	{
	471	debugfs_remove(ieee80211_debugfs_dir);
55682965	472	nl80211_exit();
704232c2 JB	473	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
704232c2 JB	474	wiphy_sysfs_exit();
b2e1b302	475	regulatory_exit();
704232c2 JB	476	}
704232c2 JB	477	module_exit(cfg80211_exit);