[mirror_ubuntu-artful-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/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 "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,
 * country_ie_regdomain, the reg_beacon_list and the the last regulatory
 * request receipt (last_request).
 */
DEFINE_MUTEX(cfg80211_mutex);

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

/* requires cfg80211_mutex to be held! */
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;

	assert_cfg80211_lock();

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

	return result;
}

int get_wiphy_idx(struct wiphy *wiphy)
{
	struct cfg80211_registered_device *drv;
	if (!wiphy)
		return WIPHY_IDX_STALE;
	drv = wiphy_to_dev(wiphy);
	return drv->wiphy_idx;
}

/* requires cfg80211_drv_mutex to be held! */
struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
{
	struct cfg80211_registered_device *drv;

	if (!wiphy_idx_valid(wiphy_idx))
		return NULL;

	assert_cfg80211_lock();

	drv = cfg80211_drv_by_wiphy_idx(wiphy_idx);
	if (!drv)
		return NULL;
	return &drv->wiphy;
}

/* requires cfg80211_mutex to be held! */
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;

	assert_cfg80211_lock();

	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);
}

/* requires cfg80211_mutex to be held */
int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
			char *newname)
{
	struct cfg80211_registered_device *drv;
	int wiphy_idx, taken = -1, result, digits;

	assert_cfg80211_lock();

	/* 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
		 */
		if (taken == strlen(PHY_NAME) + digits)
			return -EINVAL;
	}


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

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

	result = device_rename(&rdev->wiphy.dev, newname);
	if (result)
		return result;

	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);

	nl80211_notify_dev_rename(rdev);

	return 0;
}

/* 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;

	/*
	 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
	 * Fragmentation and RTS threshold are disabled by default with the
	 * special -1 value.
	 */
	drv->wiphy.retry_short = 7;
	drv->wiphy.retry_long = 4;
	drv->wiphy.frag_threshold = (u32) -1;
	drv->wiphy.rts_threshold = (u32) -1;

	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, NL80211_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;

	if (wiphy->custom_regulatory) {
		struct regulatory_request request;

		request.wiphy_idx = get_wiphy_idx(wiphy);
		request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
		request.alpha2[0] = '9';
		request.alpha2[1] = '9';

		nl80211_send_reg_change_event(&request);
	}

	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_GOING_DOWN:
		if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_ADHOC)
			break;
		if (!dev->ieee80211_ptr->ssid_len)
			break;
		cfg80211_leave_ibss(rdev, dev);
		break;
	case NETDEV_UP:
#ifdef CONFIG_WIRELESS_EXT
		if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_ADHOC)
			break;
		if (!dev->ieee80211_ptr->wext.ssid_len)
			break;
		cfg80211_join_ibss(rdev, dev, &dev->ieee80211_ptr->wext);
		break;
#endif
	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>
704232c2 JB	10	#include <linux/list.h>
	11	#include <linux/nl80211.h>
	12	#include <linux/debugfs.h>
	13	#include <linux/notifier.h>
	14	#include <linux/device.h>
	15	#include <net/genetlink.h>
	16	#include <net/cfg80211.h>
55682965	17	#include "nl80211.h"
704232c2 JB	18	#include "core.h"
	19	#include "sysfs.h"
	20
	21	/* name for sysfs, %d is appended */
	22	#define PHY_NAME "phy"
	23
	24	MODULE_AUTHOR("Johannes Berg");
	25	MODULE_LICENSE("GPL");
	26	MODULE_DESCRIPTION("wireless configuration support");
	27
	28	/* RCU might be appropriate here since we usually
	29	* only read the list, and that can happen quite
	30	* often because we need to do it for each command */
	31	LIST_HEAD(cfg80211_drv_list);
a1794390 LR	32
a1794390 LR	33	/*
e38f8a7a LR	34	* This is used to protect the cfg80211_drv_list, cfg80211_regdomain,
	35	* country_ie_regdomain, the reg_beacon_list and the the last regulatory
	36	* request receipt (last_request).
a1794390 LR	37	*/
a1794390 LR	38	DEFINE_MUTEX(cfg80211_mutex);
704232c2 JB	39
	40	/* for debugfs */
	41	static struct dentry *ieee80211_debugfs_dir;
	42
806a9e39 LR	43	/* requires cfg80211_mutex to be held! */
806a9e39 LR	44	struct cfg80211_registered_device *cfg80211_drv_by_wiphy_idx(int wiphy_idx)
55682965 JB	45	{
	46	struct cfg80211_registered_device result = NULL, drv;
	47
85fd129a LR	48	if (!wiphy_idx_valid(wiphy_idx))
	49	return NULL;
	50
761cf7ec LR	51	assert_cfg80211_lock();
761cf7ec LR	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
806a9e39 LR	63	int get_wiphy_idx(struct wiphy *wiphy)
	64	{
	65	struct cfg80211_registered_device *drv;
	66	if (!wiphy)
	67	return WIPHY_IDX_STALE;
	68	drv = wiphy_to_dev(wiphy);
	69	return drv->wiphy_idx;
	70	}
	71
	72	/* requires cfg80211_drv_mutex to be held! */
	73	struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
	74	{
	75	struct cfg80211_registered_device *drv;
	76
	77	if (!wiphy_idx_valid(wiphy_idx))
	78	return NULL;
	79
	80	assert_cfg80211_lock();
	81
	82	drv = cfg80211_drv_by_wiphy_idx(wiphy_idx);
	83	if (!drv)
	84	return NULL;
	85	return &drv->wiphy;
	86	}
	87
a1794390	88	/* requires cfg80211_mutex to be held! */
4bbf4d56	89	struct cfg80211_registered_device *
55682965 JB	90	__cfg80211_drv_from_info(struct genl_info *info)
	91	{
	92	int ifindex;
b5850a7a	93	struct cfg80211_registered_device bywiphyidx = NULL, byifidx = NULL;
55682965 JB	94	struct net_device *dev;
	95	int err = -EINVAL;
	96
761cf7ec LR	97	assert_cfg80211_lock();
761cf7ec LR	98
55682965	99	if (info->attrs[NL80211_ATTR_WIPHY]) {
b5850a7a	100	bywiphyidx = cfg80211_drv_by_wiphy_idx(
55682965 JB	101	nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
	102	err = -ENODEV;
	103	}
	104
	105	if (info->attrs[NL80211_ATTR_IFINDEX]) {
	106	ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
	107	dev = dev_get_by_index(&init_net, ifindex);
	108	if (dev) {
	109	if (dev->ieee80211_ptr)
	110	byifidx =
	111	wiphy_to_dev(dev->ieee80211_ptr->wiphy);
	112	dev_put(dev);
	113	}
	114	err = -ENODEV;
	115	}
	116
b5850a7a LR	117	if (bywiphyidx && byifidx) {
b5850a7a LR	118	if (bywiphyidx != byifidx)
55682965 JB	119	return ERR_PTR(-EINVAL);
55682965 JB	120	else
b5850a7a	121	return bywiphyidx; /* == byifidx */
55682965	122	}
b5850a7a LR	123	if (bywiphyidx)
b5850a7a LR	124	return bywiphyidx;
55682965 JB	125
	126	if (byifidx)
	127	return byifidx;
	128
	129	return ERR_PTR(err);
	130	}
	131
	132	struct cfg80211_registered_device *
	133	cfg80211_get_dev_from_info(struct genl_info *info)
	134	{
	135	struct cfg80211_registered_device *drv;
	136
a1794390	137	mutex_lock(&cfg80211_mutex);
55682965 JB	138	drv = __cfg80211_drv_from_info(info);
	139
	140	/* if it is not an error we grab the lock on
	141	* it to assure it won't be going away while
	142	* we operate on it */
	143	if (!IS_ERR(drv))
	144	mutex_lock(&drv->mtx);
	145
a1794390	146	mutex_unlock(&cfg80211_mutex);
55682965 JB	147
	148	return drv;
	149	}
	150
	151	struct cfg80211_registered_device *
	152	cfg80211_get_dev_from_ifindex(int ifindex)
	153	{
	154	struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV);
	155	struct net_device *dev;
	156
a1794390	157	mutex_lock(&cfg80211_mutex);
55682965 JB	158	dev = dev_get_by_index(&init_net, ifindex);
	159	if (!dev)
	160	goto out;
	161	if (dev->ieee80211_ptr) {
	162	drv = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
	163	mutex_lock(&drv->mtx);
	164	} else
	165	drv = ERR_PTR(-ENODEV);
	166	dev_put(dev);
	167	out:
a1794390	168	mutex_unlock(&cfg80211_mutex);
55682965 JB	169	return drv;
	170	}
	171
	172	void cfg80211_put_dev(struct cfg80211_registered_device *drv)
	173	{
	174	BUG_ON(IS_ERR(drv));
	175	mutex_unlock(&drv->mtx);
	176	}
	177
4bbf4d56	178	/* requires cfg80211_mutex to be held */
55682965 JB	179	int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
	180	char *newname)
	181	{
2940bb69	182	struct cfg80211_registered_device *drv;
b5850a7a	183	int wiphy_idx, taken = -1, result, digits;
55682965	184
4bbf4d56	185	assert_cfg80211_lock();
2940bb69	186
55682965	187	/* prohibit calling the thing phy%d when %d is not its number */
b5850a7a LR	188	sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
	189	if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
	190	/* count number of places needed to print wiphy_idx */
55682965	191	digits = 1;
b5850a7a	192	while (wiphy_idx /= 10)
55682965 JB	193	digits++;
	194	/*
	195	* deny the name if it is phy<idx> where <idx> is printed
	196	* without leading zeroes. taken == strlen(newname) here
	197	*/
	198	if (taken == strlen(PHY_NAME) + digits)
4bbf4d56	199	return -EINVAL;
2940bb69 EB	200	}
	201
	202
	203	/* Ignore nop renames */
2940bb69	204	if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
4bbf4d56	205	return 0;
2940bb69 EB	206
2940bb69 EB	207	/* Ensure another device does not already have this name. */
4bbf4d56	208	list_for_each_entry(drv, &cfg80211_drv_list, list)
2940bb69	209	if (strcmp(newname, dev_name(&drv->wiphy.dev)) == 0)
4bbf4d56	210	return -EINVAL;
55682965	211
55682965 JB	212	result = device_rename(&rdev->wiphy.dev, newname);
55682965 JB	213	if (result)
4bbf4d56	214	return result;
55682965	215
33c0360b JB	216	if (rdev->wiphy.debugfsdir &&
33c0360b JB	217	!debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
55682965 JB	218	rdev->wiphy.debugfsdir,
	219	rdev->wiphy.debugfsdir->d_parent,
	220	newname))
	221	printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
	222	newname);
	223
4bbf4d56	224	nl80211_notify_dev_rename(rdev);
55682965	225
4bbf4d56	226	return 0;
55682965 JB	227	}
55682965 JB	228
704232c2 JB	229	/* exported functions */
	230
	231	struct wiphy wiphy_new(struct cfg80211_ops ops, int sizeof_priv)
	232	{
638af073 DC	233	static int wiphy_counter;
638af073 DC	234
704232c2 JB	235	struct cfg80211_registered_device *drv;
	236	int alloc_size;
	237
41ade00f JB	238	WARN_ON(!ops->add_key && ops->del_key);
	239	WARN_ON(ops->add_key && !ops->del_key);
	240
704232c2 JB	241	alloc_size = sizeof(*drv) + sizeof_priv;
	242
	243	drv = kzalloc(alloc_size, GFP_KERNEL);
	244	if (!drv)
	245	return NULL;
	246
	247	drv->ops = ops;
	248
a1794390	249	mutex_lock(&cfg80211_mutex);
704232c2	250
b5850a7a	251	drv->wiphy_idx = wiphy_counter++;
a4d73ee1	252
85fd129a	253	if (unlikely(!wiphy_idx_valid(drv->wiphy_idx))) {
638af073	254	wiphy_counter--;
a1794390	255	mutex_unlock(&cfg80211_mutex);
704232c2 JB	256	/* ugh, wrapped! */
	257	kfree(drv);
	258	return NULL;
	259	}
704232c2	260
a1794390	261	mutex_unlock(&cfg80211_mutex);
638af073	262
704232c2	263	/* give it a proper name */
b5850a7a	264	dev_set_name(&drv->wiphy.dev, PHY_NAME "%d", drv->wiphy_idx);
704232c2	265
704232c2 JB	266	mutex_init(&drv->mtx);
	267	mutex_init(&drv->devlist_mtx);
	268	INIT_LIST_HEAD(&drv->netdev_list);
2a519311 JB	269	spin_lock_init(&drv->bss_lock);
2a519311 JB	270	INIT_LIST_HEAD(&drv->bss_list);
704232c2 JB	271
	272	device_initialize(&drv->wiphy.dev);
	273	drv->wiphy.dev.class = &ieee80211_class;
	274	drv->wiphy.dev.platform_data = drv;
	275
b9a5f8ca JM	276	/*
	277	* Initialize wiphy parameters to IEEE 802.11 MIB default values.
	278	* Fragmentation and RTS threshold are disabled by default with the
	279	* special -1 value.
	280	*/
	281	drv->wiphy.retry_short = 7;
	282	drv->wiphy.retry_long = 4;
	283	drv->wiphy.frag_threshold = (u32) -1;
	284	drv->wiphy.rts_threshold = (u32) -1;
	285
704232c2 JB	286	return &drv->wiphy;
	287	}
	288	EXPORT_SYMBOL(wiphy_new);
	289
	290	int wiphy_register(struct wiphy *wiphy)
	291	{
	292	struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
	293	int res;
8318d78a JB	294	enum ieee80211_band band;
	295	struct ieee80211_supported_band *sband;
	296	bool have_band = false;
	297	int i;
f59ac048 LR	298	u16 ifmodes = wiphy->interface_modes;
f59ac048 LR	299
2a519311 JB	300	if (WARN_ON(wiphy->max_scan_ssids < 1))
	301	return -EINVAL;
	302
f59ac048 LR	303	/* sanity check ifmodes */
	304	WARN_ON(!ifmodes);
	305	ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
	306	if (WARN_ON(ifmodes != wiphy->interface_modes))
	307	wiphy->interface_modes = ifmodes;
8318d78a JB	308
	309	/* sanity check supported bands/channels */
	310	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
	311	sband = wiphy->bands[band];
	312	if (!sband)
	313	continue;
	314
	315	sband->band = band;
	316
881d948c JB	317	if (WARN_ON(!sband->n_channels \|\| !sband->n_bitrates))
	318	return -EINVAL;
	319
	320	/*
	321	* Since we use a u32 for rate bitmaps in
	322	* ieee80211_get_response_rate, we cannot
	323	* have more than 32 legacy rates.
	324	*/
	325	if (WARN_ON(sband->n_bitrates > 32))
8318d78a	326	return -EINVAL;
8318d78a JB	327
	328	for (i = 0; i < sband->n_channels; i++) {
	329	sband->channels[i].orig_flags =
	330	sband->channels[i].flags;
	331	sband->channels[i].orig_mag =
	332	sband->channels[i].max_antenna_gain;
	333	sband->channels[i].orig_mpwr =
	334	sband->channels[i].max_power;
	335	sband->channels[i].band = band;
	336	}
	337
	338	have_band = true;
	339	}
	340
	341	if (!have_band) {
	342	WARN_ON(1);
	343	return -EINVAL;
	344	}
	345
	346	/* check and set up bitrates */
	347	ieee80211_set_bitrate_flags(wiphy);
	348
a1794390	349	mutex_lock(&cfg80211_mutex);
f3b407fb	350
8318d78a	351	/* set up regulatory info */
7db90f4a	352	wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
704232c2	353
704232c2 JB	354	res = device_add(&drv->wiphy.dev);
	355	if (res)
	356	goto out_unlock;
	357
	358	list_add(&drv->list, &cfg80211_drv_list);
	359
	360	/* add to debugfs */
	361	drv->wiphy.debugfsdir =
	362	debugfs_create_dir(wiphy_name(&drv->wiphy),
	363	ieee80211_debugfs_dir);
33c0360b JB	364	if (IS_ERR(drv->wiphy.debugfsdir))
33c0360b JB	365	drv->wiphy.debugfsdir = NULL;
704232c2	366
73d54c9e LR	367	if (wiphy->custom_regulatory) {
	368	struct regulatory_request request;
	369
	370	request.wiphy_idx = get_wiphy_idx(wiphy);
	371	request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
	372	request.alpha2[0] = '9';
	373	request.alpha2[1] = '9';
	374
	375	nl80211_send_reg_change_event(&request);
	376	}
	377
704232c2 JB	378	res = 0;
704232c2 JB	379	out_unlock:
a1794390	380	mutex_unlock(&cfg80211_mutex);
704232c2 JB	381	return res;
	382	}
	383	EXPORT_SYMBOL(wiphy_register);
	384
	385	void wiphy_unregister(struct wiphy *wiphy)
	386	{
	387	struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
	388
f16bfc1c	389	/* protect the device list */
a1794390	390	mutex_lock(&cfg80211_mutex);
704232c2	391
f16bfc1c JB	392	BUG_ON(!list_empty(&drv->netdev_list));
	393
	394	/*
	395	* Try to grab drv->mtx. If a command is still in progress,
	396	* hopefully the driver will refuse it since it's tearing
	397	* down the device already. We wait for this command to complete
	398	* before unlinking the item from the list.
	399	* Note: as codified by the BUG_ON above we cannot get here if
	400	* a virtual interface is still associated. Hence, we can only
	401	* get to lock contention here if userspace issues a command
	402	* that identified the hardware by wiphy index.
	403	*/
704232c2	404	mutex_lock(&drv->mtx);
f16bfc1c	405	/* unlock again before freeing */
704232c2 JB	406	mutex_unlock(&drv->mtx);
704232c2 JB	407
3f2355cb LR	408	/* If this device got a regulatory hint tell core its
	409	* free to listen now to a new shiny device regulatory hint */
	410	reg_device_remove(wiphy);
	411
f16bfc1c	412	list_del(&drv->list);
704232c2 JB	413	device_del(&drv->wiphy.dev);
	414	debugfs_remove(drv->wiphy.debugfsdir);
	415
a1794390	416	mutex_unlock(&cfg80211_mutex);
704232c2 JB	417	}
	418	EXPORT_SYMBOL(wiphy_unregister);
	419
	420	void cfg80211_dev_free(struct cfg80211_registered_device *drv)
	421	{
2a519311	422	struct cfg80211_internal_bss scan, tmp;
704232c2 JB	423	mutex_destroy(&drv->mtx);
704232c2 JB	424	mutex_destroy(&drv->devlist_mtx);
2a519311	425	list_for_each_entry_safe(scan, tmp, &drv->bss_list, list)
78c1c7e1	426	cfg80211_put_bss(&scan->pub);
704232c2 JB	427	kfree(drv);
	428	}
	429
	430	void wiphy_free(struct wiphy *wiphy)
	431	{
	432	put_device(&wiphy->dev);
	433	}
	434	EXPORT_SYMBOL(wiphy_free);
	435
	436	static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
	437	unsigned long state,
	438	void *ndev)
	439	{
	440	struct net_device *dev = ndev;
	441	struct cfg80211_registered_device *rdev;
	442
	443	if (!dev->ieee80211_ptr)
	444	return 0;
	445
	446	rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
	447
60719ffd JB	448	WARN_ON(dev->ieee80211_ptr->iftype == NL80211_IFTYPE_UNSPECIFIED);
60719ffd JB	449
704232c2 JB	450	switch (state) {
	451	case NETDEV_REGISTER:
	452	mutex_lock(&rdev->devlist_mtx);
	453	list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list);
	454	if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
	455	"phy80211")) {
	456	printk(KERN_ERR "wireless: failed to add phy80211 "
	457	"symlink to netdev!\n");
	458	}
	459	dev->ieee80211_ptr->netdev = dev;
	460	mutex_unlock(&rdev->devlist_mtx);
	461	break;
04a773ad JB	462	case NETDEV_GOING_DOWN:
	463	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_ADHOC)
	464	break;
	465	if (!dev->ieee80211_ptr->ssid_len)
	466	break;
	467	cfg80211_leave_ibss(rdev, dev);
	468	break;
	469	case NETDEV_UP:
	470	#ifdef CONFIG_WIRELESS_EXT
	471	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_ADHOC)
	472	break;
	473	if (!dev->ieee80211_ptr->wext.ssid_len)
	474	break;
	475	cfg80211_join_ibss(rdev, dev, &dev->ieee80211_ptr->wext);
	476	break;
	477	#endif
704232c2 JB	478	case NETDEV_UNREGISTER:
	479	mutex_lock(&rdev->devlist_mtx);
	480	if (!list_empty(&dev->ieee80211_ptr->list)) {
	481	sysfs_remove_link(&dev->dev.kobj, "phy80211");
	482	list_del_init(&dev->ieee80211_ptr->list);
	483	}
	484	mutex_unlock(&rdev->devlist_mtx);
	485	break;
	486	}
	487
	488	return 0;
	489	}
	490
	491	static struct notifier_block cfg80211_netdev_notifier = {
	492	.notifier_call = cfg80211_netdev_notifier_call,
	493	};
	494
	495	static int cfg80211_init(void)
	496	{
b2e1b302 LR	497	int err;
b2e1b302 LR	498
b2e1b302	499	err = wiphy_sysfs_init();
704232c2 JB	500	if (err)
	501	goto out_fail_sysfs;
	502
	503	err = register_netdevice_notifier(&cfg80211_netdev_notifier);
	504	if (err)
	505	goto out_fail_notifier;
	506
55682965 JB	507	err = nl80211_init();
	508	if (err)
	509	goto out_fail_nl80211;
	510
704232c2 JB	511	ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
704232c2 JB	512
b2e1b302 LR	513	err = regulatory_init();
	514	if (err)
	515	goto out_fail_reg;
	516
704232c2 JB	517	return 0;
704232c2 JB	518
b2e1b302 LR	519	out_fail_reg:
b2e1b302 LR	520	debugfs_remove(ieee80211_debugfs_dir);
55682965 JB	521	out_fail_nl80211:
55682965 JB	522	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
704232c2 JB	523	out_fail_notifier:
	524	wiphy_sysfs_exit();
	525	out_fail_sysfs:
	526	return err;
	527	}
b2e1b302	528
3a462465	529	subsys_initcall(cfg80211_init);
704232c2 JB	530
	531	static void cfg80211_exit(void)
	532	{
	533	debugfs_remove(ieee80211_debugfs_dir);
55682965	534	nl80211_exit();
704232c2 JB	535	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
704232c2 JB	536	wiphy_sysfs_exit();
b2e1b302	537	regulatory_exit();
704232c2 JB	538	}
704232c2 JB	539	module_exit(cfg80211_exit);