[GitHub/mt8127/android_kernel_alcatel_ttab.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);

/*
 * This is used to protect the cfg80211_drv_list, cfg80211_regdomain, and
 * the last reguluatory request receipt in regd.c
 */
DEFINE_MUTEX(cfg80211_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;

	if (!wiphy_idx_valid(wiphy_idx))
		return NULL;

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

	return result;
}

/* requires cfg80211_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_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_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_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_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_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_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_mutex);

	drv->wiphy_idx = wiphy_counter++;

	if (unlikely(!wiphy_idx_valid(drv->wiphy_idx))) {
		wiphy_counter--;
		mutex_unlock(&cfg80211_mutex);
		/* ugh, wrapped! */
		kfree(drv);
		return NULL;
	}

	mutex_unlock(&cfg80211_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_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_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_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_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);
a1794390 LR	34
	35	/*
	36	* This is used to protect the cfg80211_drv_list, cfg80211_regdomain, and
	37	* the last reguluatory request receipt in regd.c
	38	*/
	39	DEFINE_MUTEX(cfg80211_mutex);
704232c2 JB	40
	41	/* for debugfs */
	42	static struct dentry *ieee80211_debugfs_dir;
	43
55682965	44	/* requires cfg80211_drv_mutex to be held! */
b5850a7a LR	45	static struct cfg80211_registered_device *
b5850a7a LR	46	cfg80211_drv_by_wiphy_idx(int wiphy_idx)
55682965 JB	47	{
	48	struct cfg80211_registered_device result = NULL, drv;
	49
85fd129a LR	50	if (!wiphy_idx_valid(wiphy_idx))
	51	return NULL;
	52
55682965	53	list_for_each_entry(drv, &cfg80211_drv_list, list) {
b5850a7a	54	if (drv->wiphy_idx == wiphy_idx) {
55682965 JB	55	result = drv;
	56	break;
	57	}
	58	}
	59
	60	return result;
	61	}
	62
a1794390	63	/* requires cfg80211_mutex to be held! */
55682965 JB	64	static struct cfg80211_registered_device *
	65	__cfg80211_drv_from_info(struct genl_info *info)
	66	{
	67	int ifindex;
b5850a7a	68	struct cfg80211_registered_device bywiphyidx = NULL, byifidx = NULL;
55682965 JB	69	struct net_device *dev;
	70	int err = -EINVAL;
	71
	72	if (info->attrs[NL80211_ATTR_WIPHY]) {
b5850a7a	73	bywiphyidx = cfg80211_drv_by_wiphy_idx(
55682965 JB	74	nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
	75	err = -ENODEV;
	76	}
	77
	78	if (info->attrs[NL80211_ATTR_IFINDEX]) {
	79	ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
	80	dev = dev_get_by_index(&init_net, ifindex);
	81	if (dev) {
	82	if (dev->ieee80211_ptr)
	83	byifidx =
	84	wiphy_to_dev(dev->ieee80211_ptr->wiphy);
	85	dev_put(dev);
	86	}
	87	err = -ENODEV;
	88	}
	89
b5850a7a LR	90	if (bywiphyidx && byifidx) {
b5850a7a LR	91	if (bywiphyidx != byifidx)
55682965 JB	92	return ERR_PTR(-EINVAL);
55682965 JB	93	else
b5850a7a	94	return bywiphyidx; /* == byifidx */
55682965	95	}
b5850a7a LR	96	if (bywiphyidx)
b5850a7a LR	97	return bywiphyidx;
55682965 JB	98
	99	if (byifidx)
	100	return byifidx;
	101
	102	return ERR_PTR(err);
	103	}
	104
	105	struct cfg80211_registered_device *
	106	cfg80211_get_dev_from_info(struct genl_info *info)
	107	{
	108	struct cfg80211_registered_device *drv;
	109
a1794390	110	mutex_lock(&cfg80211_mutex);
55682965 JB	111	drv = __cfg80211_drv_from_info(info);
	112
	113	/* if it is not an error we grab the lock on
	114	* it to assure it won't be going away while
	115	* we operate on it */
	116	if (!IS_ERR(drv))
	117	mutex_lock(&drv->mtx);
	118
a1794390	119	mutex_unlock(&cfg80211_mutex);
55682965 JB	120
	121	return drv;
	122	}
	123
	124	struct cfg80211_registered_device *
	125	cfg80211_get_dev_from_ifindex(int ifindex)
	126	{
	127	struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV);
	128	struct net_device *dev;
	129
a1794390	130	mutex_lock(&cfg80211_mutex);
55682965 JB	131	dev = dev_get_by_index(&init_net, ifindex);
	132	if (!dev)
	133	goto out;
	134	if (dev->ieee80211_ptr) {
	135	drv = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
	136	mutex_lock(&drv->mtx);
	137	} else
	138	drv = ERR_PTR(-ENODEV);
	139	dev_put(dev);
	140	out:
a1794390	141	mutex_unlock(&cfg80211_mutex);
55682965 JB	142	return drv;
	143	}
	144
	145	void cfg80211_put_dev(struct cfg80211_registered_device *drv)
	146	{
	147	BUG_ON(IS_ERR(drv));
	148	mutex_unlock(&drv->mtx);
	149	}
	150
	151	int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
	152	char *newname)
	153	{
2940bb69	154	struct cfg80211_registered_device *drv;
b5850a7a	155	int wiphy_idx, taken = -1, result, digits;
55682965	156
a1794390	157	mutex_lock(&cfg80211_mutex);
2940bb69	158
55682965	159	/* prohibit calling the thing phy%d when %d is not its number */
b5850a7a LR	160	sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
	161	if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
	162	/* count number of places needed to print wiphy_idx */
55682965	163	digits = 1;
b5850a7a	164	while (wiphy_idx /= 10)
55682965 JB	165	digits++;
	166	/*
	167	* deny the name if it is phy<idx> where <idx> is printed
	168	* without leading zeroes. taken == strlen(newname) here
	169	*/
2940bb69	170	result = -EINVAL;
55682965	171	if (taken == strlen(PHY_NAME) + digits)
2940bb69 EB	172	goto out_unlock;
	173	}
	174
	175
	176	/* Ignore nop renames */
	177	result = 0;
	178	if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
	179	goto out_unlock;
	180
	181	/* Ensure another device does not already have this name. */
	182	list_for_each_entry(drv, &cfg80211_drv_list, list) {
	183	result = -EINVAL;
	184	if (strcmp(newname, dev_name(&drv->wiphy.dev)) == 0)
	185	goto out_unlock;
55682965 JB	186	}
55682965 JB	187
2940bb69 EB	188	/* this will only check for collisions in sysfs
	189	* which is not even always compiled in.
	190	*/
55682965 JB	191	result = device_rename(&rdev->wiphy.dev, newname);
55682965 JB	192	if (result)
2940bb69	193	goto out_unlock;
55682965	194
33c0360b JB	195	if (rdev->wiphy.debugfsdir &&
33c0360b JB	196	!debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
55682965 JB	197	rdev->wiphy.debugfsdir,
	198	rdev->wiphy.debugfsdir->d_parent,
	199	newname))
	200	printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
	201	newname);
	202
2940bb69 EB	203	result = 0;
2940bb69 EB	204	out_unlock:
a1794390	205	mutex_unlock(&cfg80211_mutex);
2940bb69 EB	206	if (result == 0)
2940bb69 EB	207	nl80211_notify_dev_rename(rdev);
55682965	208
2940bb69	209	return result;
55682965 JB	210	}
55682965 JB	211
704232c2 JB	212	/* exported functions */
	213
	214	struct wiphy wiphy_new(struct cfg80211_ops ops, int sizeof_priv)
	215	{
638af073 DC	216	static int wiphy_counter;
638af073 DC	217
704232c2 JB	218	struct cfg80211_registered_device *drv;
	219	int alloc_size;
	220
41ade00f JB	221	WARN_ON(!ops->add_key && ops->del_key);
	222	WARN_ON(ops->add_key && !ops->del_key);
	223
704232c2 JB	224	alloc_size = sizeof(*drv) + sizeof_priv;
	225
	226	drv = kzalloc(alloc_size, GFP_KERNEL);
	227	if (!drv)
	228	return NULL;
	229
	230	drv->ops = ops;
	231
a1794390	232	mutex_lock(&cfg80211_mutex);
704232c2	233
b5850a7a	234	drv->wiphy_idx = wiphy_counter++;
a4d73ee1	235
85fd129a	236	if (unlikely(!wiphy_idx_valid(drv->wiphy_idx))) {
638af073	237	wiphy_counter--;
a1794390	238	mutex_unlock(&cfg80211_mutex);
704232c2 JB	239	/* ugh, wrapped! */
	240	kfree(drv);
	241	return NULL;
	242	}
704232c2	243
a1794390	244	mutex_unlock(&cfg80211_mutex);
638af073	245
704232c2	246	/* give it a proper name */
b5850a7a	247	dev_set_name(&drv->wiphy.dev, PHY_NAME "%d", drv->wiphy_idx);
704232c2	248
704232c2 JB	249	mutex_init(&drv->mtx);
	250	mutex_init(&drv->devlist_mtx);
	251	INIT_LIST_HEAD(&drv->netdev_list);
2a519311 JB	252	spin_lock_init(&drv->bss_lock);
2a519311 JB	253	INIT_LIST_HEAD(&drv->bss_list);
704232c2 JB	254
	255	device_initialize(&drv->wiphy.dev);
	256	drv->wiphy.dev.class = &ieee80211_class;
	257	drv->wiphy.dev.platform_data = drv;
	258
	259	return &drv->wiphy;
	260	}
	261	EXPORT_SYMBOL(wiphy_new);
	262
	263	int wiphy_register(struct wiphy *wiphy)
	264	{
	265	struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
	266	int res;
8318d78a JB	267	enum ieee80211_band band;
	268	struct ieee80211_supported_band *sband;
	269	bool have_band = false;
	270	int i;
f59ac048 LR	271	u16 ifmodes = wiphy->interface_modes;
f59ac048 LR	272
2a519311 JB	273	if (WARN_ON(wiphy->max_scan_ssids < 1))
	274	return -EINVAL;
	275
f59ac048 LR	276	/* sanity check ifmodes */
	277	WARN_ON(!ifmodes);
	278	ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
	279	if (WARN_ON(ifmodes != wiphy->interface_modes))
	280	wiphy->interface_modes = ifmodes;
8318d78a JB	281
	282	/* sanity check supported bands/channels */
	283	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
	284	sband = wiphy->bands[band];
	285	if (!sband)
	286	continue;
	287
	288	sband->band = band;
	289
881d948c JB	290	if (WARN_ON(!sband->n_channels \|\| !sband->n_bitrates))
	291	return -EINVAL;
	292
	293	/*
	294	* Since we use a u32 for rate bitmaps in
	295	* ieee80211_get_response_rate, we cannot
	296	* have more than 32 legacy rates.
	297	*/
	298	if (WARN_ON(sband->n_bitrates > 32))
8318d78a	299	return -EINVAL;
8318d78a JB	300
	301	for (i = 0; i < sband->n_channels; i++) {
	302	sband->channels[i].orig_flags =
	303	sband->channels[i].flags;
	304	sband->channels[i].orig_mag =
	305	sband->channels[i].max_antenna_gain;
	306	sband->channels[i].orig_mpwr =
	307	sband->channels[i].max_power;
	308	sband->channels[i].band = band;
	309	}
	310
	311	have_band = true;
	312	}
	313
	314	if (!have_band) {
	315	WARN_ON(1);
	316	return -EINVAL;
	317	}
	318
	319	/* check and set up bitrates */
	320	ieee80211_set_bitrate_flags(wiphy);
	321
a1794390	322	mutex_lock(&cfg80211_mutex);
f3b407fb	323
8318d78a	324	/* set up regulatory info */
b2e1b302	325	wiphy_update_regulatory(wiphy, REGDOM_SET_BY_CORE);
704232c2	326
704232c2 JB	327	res = device_add(&drv->wiphy.dev);
	328	if (res)
	329	goto out_unlock;
	330
	331	list_add(&drv->list, &cfg80211_drv_list);
	332
	333	/* add to debugfs */
	334	drv->wiphy.debugfsdir =
	335	debugfs_create_dir(wiphy_name(&drv->wiphy),
	336	ieee80211_debugfs_dir);
33c0360b JB	337	if (IS_ERR(drv->wiphy.debugfsdir))
33c0360b JB	338	drv->wiphy.debugfsdir = NULL;
704232c2 JB	339
	340	res = 0;
	341	out_unlock:
a1794390	342	mutex_unlock(&cfg80211_mutex);
704232c2 JB	343	return res;
	344	}
	345	EXPORT_SYMBOL(wiphy_register);
	346
	347	void wiphy_unregister(struct wiphy *wiphy)
	348	{
	349	struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
	350
f16bfc1c	351	/* protect the device list */
a1794390	352	mutex_lock(&cfg80211_mutex);
704232c2	353
f16bfc1c JB	354	BUG_ON(!list_empty(&drv->netdev_list));
	355
	356	/*
	357	* Try to grab drv->mtx. If a command is still in progress,
	358	* hopefully the driver will refuse it since it's tearing
	359	* down the device already. We wait for this command to complete
	360	* before unlinking the item from the list.
	361	* Note: as codified by the BUG_ON above we cannot get here if
	362	* a virtual interface is still associated. Hence, we can only
	363	* get to lock contention here if userspace issues a command
	364	* that identified the hardware by wiphy index.
	365	*/
704232c2	366	mutex_lock(&drv->mtx);
f16bfc1c	367	/* unlock again before freeing */
704232c2 JB	368	mutex_unlock(&drv->mtx);
704232c2 JB	369
3f2355cb LR	370	/* If this device got a regulatory hint tell core its
	371	* free to listen now to a new shiny device regulatory hint */
	372	reg_device_remove(wiphy);
	373
f16bfc1c	374	list_del(&drv->list);
704232c2 JB	375	device_del(&drv->wiphy.dev);
	376	debugfs_remove(drv->wiphy.debugfsdir);
	377
a1794390	378	mutex_unlock(&cfg80211_mutex);
704232c2 JB	379	}
	380	EXPORT_SYMBOL(wiphy_unregister);
	381
	382	void cfg80211_dev_free(struct cfg80211_registered_device *drv)
	383	{
2a519311	384	struct cfg80211_internal_bss scan, tmp;
704232c2 JB	385	mutex_destroy(&drv->mtx);
704232c2 JB	386	mutex_destroy(&drv->devlist_mtx);
2a519311	387	list_for_each_entry_safe(scan, tmp, &drv->bss_list, list)
78c1c7e1	388	cfg80211_put_bss(&scan->pub);
704232c2 JB	389	kfree(drv);
	390	}
	391
	392	void wiphy_free(struct wiphy *wiphy)
	393	{
	394	put_device(&wiphy->dev);
	395	}
	396	EXPORT_SYMBOL(wiphy_free);
	397
	398	static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
	399	unsigned long state,
	400	void *ndev)
	401	{
	402	struct net_device *dev = ndev;
	403	struct cfg80211_registered_device *rdev;
	404
	405	if (!dev->ieee80211_ptr)
	406	return 0;
	407
	408	rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
	409
60719ffd JB	410	WARN_ON(dev->ieee80211_ptr->iftype == NL80211_IFTYPE_UNSPECIFIED);
60719ffd JB	411
704232c2 JB	412	switch (state) {
	413	case NETDEV_REGISTER:
	414	mutex_lock(&rdev->devlist_mtx);
	415	list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list);
	416	if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
	417	"phy80211")) {
	418	printk(KERN_ERR "wireless: failed to add phy80211 "
	419	"symlink to netdev!\n");
	420	}
	421	dev->ieee80211_ptr->netdev = dev;
	422	mutex_unlock(&rdev->devlist_mtx);
	423	break;
	424	case NETDEV_UNREGISTER:
	425	mutex_lock(&rdev->devlist_mtx);
	426	if (!list_empty(&dev->ieee80211_ptr->list)) {
	427	sysfs_remove_link(&dev->dev.kobj, "phy80211");
	428	list_del_init(&dev->ieee80211_ptr->list);
	429	}
	430	mutex_unlock(&rdev->devlist_mtx);
	431	break;
	432	}
	433
	434	return 0;
	435	}
	436
	437	static struct notifier_block cfg80211_netdev_notifier = {
	438	.notifier_call = cfg80211_netdev_notifier_call,
	439	};
	440
	441	static int cfg80211_init(void)
	442	{
b2e1b302 LR	443	int err;
b2e1b302 LR	444
b2e1b302	445	err = wiphy_sysfs_init();
704232c2 JB	446	if (err)
	447	goto out_fail_sysfs;
	448
	449	err = register_netdevice_notifier(&cfg80211_netdev_notifier);
	450	if (err)
	451	goto out_fail_notifier;
	452
55682965 JB	453	err = nl80211_init();
	454	if (err)
	455	goto out_fail_nl80211;
	456
704232c2 JB	457	ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
704232c2 JB	458
b2e1b302 LR	459	err = regulatory_init();
	460	if (err)
	461	goto out_fail_reg;
	462
704232c2 JB	463	return 0;
704232c2 JB	464
b2e1b302 LR	465	out_fail_reg:
b2e1b302 LR	466	debugfs_remove(ieee80211_debugfs_dir);
55682965 JB	467	out_fail_nl80211:
55682965 JB	468	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
704232c2 JB	469	out_fail_notifier:
	470	wiphy_sysfs_exit();
	471	out_fail_sysfs:
	472	return err;
	473	}
b2e1b302	474
3a462465	475	subsys_initcall(cfg80211_init);
704232c2 JB	476
	477	static void cfg80211_exit(void)
	478	{
	479	debugfs_remove(ieee80211_debugfs_dir);
55682965	480	nl80211_exit();
704232c2 JB	481	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
704232c2 JB	482	wiphy_sysfs_exit();
b2e1b302	483	regulatory_exit();
704232c2 JB	484	}
704232c2 JB	485	module_exit(cfg80211_exit);