[mirror_ubuntu-bionic-kernel.git] / net / wireless / mesh.c

#include <linux/ieee80211.h>
#include <linux/export.h>
#include <net/cfg80211.h>
#include "nl80211.h"
#include "core.h"
#include "rdev-ops.h"

/* Default values, timeouts in ms */
#define MESH_TTL 		31
#define MESH_DEFAULT_ELEMENT_TTL 31
#define MESH_MAX_RETR	 	3
#define MESH_RET_T 		100
#define MESH_CONF_T 		100
#define MESH_HOLD_T 		100

#define MESH_PATH_TIMEOUT	5000
#define MESH_RANN_INTERVAL      5000
#define MESH_PATH_TO_ROOT_TIMEOUT      6000
#define MESH_ROOT_INTERVAL     5000
#define MESH_ROOT_CONFIRMATION_INTERVAL 2000
#define MESH_DEFAULT_PLINK_TIMEOUT	1800 /* timeout in seconds */

/*
 * Minimum interval between two consecutive PREQs originated by the same
 * interface
 */
#define MESH_PREQ_MIN_INT	10
#define MESH_PERR_MIN_INT	100
#define MESH_DIAM_TRAVERSAL_TIME 50

#define MESH_RSSI_THRESHOLD	0

/*
 * A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
 * before timing out.  This way it will remain ACTIVE and no data frames
 * will be unnecessarily held in the pending queue.
 */
#define MESH_PATH_REFRESH_TIME			1000
#define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)

/* Default maximum number of established plinks per interface */
#define MESH_MAX_ESTAB_PLINKS	32

#define MESH_MAX_PREQ_RETRIES	4

#define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50

#define MESH_DEFAULT_BEACON_INTERVAL	1000	/* in 1024 us units (=TUs) */
#define MESH_DEFAULT_DTIM_PERIOD	2
#define MESH_DEFAULT_AWAKE_WINDOW	10	/* in 1024 us units (=TUs) */

const struct mesh_config default_mesh_config = {
	.dot11MeshRetryTimeout = MESH_RET_T,
	.dot11MeshConfirmTimeout = MESH_CONF_T,
	.dot11MeshHoldingTimeout = MESH_HOLD_T,
	.dot11MeshMaxRetries = MESH_MAX_RETR,
	.dot11MeshTTL = MESH_TTL,
	.element_ttl = MESH_DEFAULT_ELEMENT_TTL,
	.auto_open_plinks = true,
	.dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
	.dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX,
	.dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
	.dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
	.dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
	.dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
	.dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
	.path_refresh_time = MESH_PATH_REFRESH_TIME,
	.min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
	.dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
	.dot11MeshGateAnnouncementProtocol = false,
	.dot11MeshForwarding = true,
	.rssi_threshold = MESH_RSSI_THRESHOLD,
	.ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED,
	.dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT,
	.dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL,
	.dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL,
	.power_mode = NL80211_MESH_POWER_ACTIVE,
	.dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW,
	.plink_timeout = MESH_DEFAULT_PLINK_TIMEOUT,
};

const struct mesh_setup default_mesh_setup = {
	/* cfg80211_join_mesh() will pick a channel if needed */
	.sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
	.path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
	.path_metric = IEEE80211_PATH_METRIC_AIRTIME,
	.auth_id = 0, /* open */
	.ie = NULL,
	.ie_len = 0,
	.is_secure = false,
	.user_mpm = false,
	.beacon_interval = MESH_DEFAULT_BEACON_INTERVAL,
	.dtim_period = MESH_DEFAULT_DTIM_PERIOD,
};

int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
			 struct net_device *dev,
			 struct mesh_setup *setup,
			 const struct mesh_config *conf)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	int err;

	BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);

	ASSERT_WDEV_LOCK(wdev);

	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
		return -EOPNOTSUPP;

	if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
	      setup->is_secure)
		return -EOPNOTSUPP;

	if (wdev->mesh_id_len)
		return -EALREADY;

	if (!setup->mesh_id_len)
		return -EINVAL;

	if (!rdev->ops->join_mesh)
		return -EOPNOTSUPP;

	if (!setup->chandef.chan) {
		/* if no channel explicitly given, use preset channel */
		setup->chandef = wdev->preset_chandef;
	}

	if (!setup->chandef.chan) {
		/* if we don't have that either, use the first usable channel */
		enum nl80211_band band;

		for (band = 0; band < NUM_NL80211_BANDS; band++) {
			struct ieee80211_supported_band *sband;
			struct ieee80211_channel *chan;
			int i;

			sband = rdev->wiphy.bands[band];
			if (!sband)
				continue;

			for (i = 0; i < sband->n_channels; i++) {
				chan = &sband->channels[i];
				if (chan->flags & (IEEE80211_CHAN_NO_IR |
						   IEEE80211_CHAN_DISABLED |
						   IEEE80211_CHAN_RADAR))
					continue;
				setup->chandef.chan = chan;
				break;
			}

			if (setup->chandef.chan)
				break;
		}

		/* no usable channel ... */
		if (!setup->chandef.chan)
			return -EINVAL;

		setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
		setup->chandef.center_freq1 = setup->chandef.chan->center_freq;
	}

	/*
	 * check if basic rates are available otherwise use mandatory rates as
	 * basic rates
	 */
	if (!setup->basic_rates) {
		enum nl80211_bss_scan_width scan_width;
		struct ieee80211_supported_band *sband =
				rdev->wiphy.bands[setup->chandef.chan->band];
		scan_width = cfg80211_chandef_to_scan_width(&setup->chandef);
		setup->basic_rates = ieee80211_mandatory_rates(sband,
							       scan_width);
	}

	if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef,
				     NL80211_IFTYPE_MESH_POINT))
		return -EINVAL;

	err = rdev_join_mesh(rdev, dev, conf, setup);
	if (!err) {
		memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
		wdev->mesh_id_len = setup->mesh_id_len;
		wdev->chandef = setup->chandef;
	}

	return err;
}

int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
		       struct net_device *dev,
		       struct mesh_setup *setup,
		       const struct mesh_config *conf)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	int err;

	wdev_lock(wdev);
	err = __cfg80211_join_mesh(rdev, dev, setup, conf);
	wdev_unlock(wdev);

	return err;
}

int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
			      struct wireless_dev *wdev,
			      struct cfg80211_chan_def *chandef)
{
	int err;

	/*
	 * Workaround for libertas (only!), it puts the interface
	 * into mesh mode but doesn't implement join_mesh. Instead,
	 * it is configured via sysfs and then joins the mesh when
	 * you set the channel. Note that the libertas mesh isn't
	 * compatible with 802.11 mesh.
	 */
	if (rdev->ops->libertas_set_mesh_channel) {
		if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
			return -EINVAL;

		if (!netif_running(wdev->netdev))
			return -ENETDOWN;

		err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev,
						     chandef->chan);
		if (!err)
			wdev->chandef = *chandef;

		return err;
	}

	if (wdev->mesh_id_len)
		return -EBUSY;

	wdev->preset_chandef = *chandef;
	return 0;
}

int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
			  struct net_device *dev)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	int err;

	ASSERT_WDEV_LOCK(wdev);

	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
		return -EOPNOTSUPP;

	if (!rdev->ops->leave_mesh)
		return -EOPNOTSUPP;

	if (!wdev->mesh_id_len)
		return -ENOTCONN;

	err = rdev_leave_mesh(rdev, dev);
	if (!err) {
		wdev->mesh_id_len = 0;
		memset(&wdev->chandef, 0, sizeof(wdev->chandef));
		rdev_set_qos_map(rdev, dev, NULL);
	}

	return err;
}

int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
			struct net_device *dev)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	int err;

	wdev_lock(wdev);
	err = __cfg80211_leave_mesh(rdev, dev);
	wdev_unlock(wdev);

	return err;
}
Commit	Line	Data
29cbe68c	1	#include <linux/ieee80211.h>
bc3b2d7f	2	#include <linux/export.h>
29cbe68c	3	#include <net/cfg80211.h>
c93b5e71	4	#include "nl80211.h"
29cbe68c	5	#include "core.h"
e35e4d28	6	#include "rdev-ops.h"
29cbe68c JB	7
	8	/* Default values, timeouts in ms */
	9	#define MESH_TTL 31
	10	#define MESH_DEFAULT_ELEMENT_TTL 31
	11	#define MESH_MAX_RETR 3
	12	#define MESH_RET_T 100
	13	#define MESH_CONF_T 100
	14	#define MESH_HOLD_T 100
	15
	16	#define MESH_PATH_TIMEOUT 5000
0507e159	17	#define MESH_RANN_INTERVAL 5000
ac1073a6 CYY	18	#define MESH_PATH_TO_ROOT_TIMEOUT 6000
ac1073a6 CYY	19	#define MESH_ROOT_INTERVAL 5000
728b19e5	20	#define MESH_ROOT_CONFIRMATION_INTERVAL 2000
8e7c0538	21	#define MESH_DEFAULT_PLINK_TIMEOUT 1800 /* timeout in seconds */
29cbe68c JB	22
	23	/*
	24	* Minimum interval between two consecutive PREQs originated by the same
	25	* interface
	26	*/
	27	#define MESH_PREQ_MIN_INT 10
dca7e943	28	#define MESH_PERR_MIN_INT 100
29cbe68c JB	29	#define MESH_DIAM_TRAVERSAL_TIME 50
29cbe68c JB	30
55335137 AN	31	#define MESH_RSSI_THRESHOLD 0
55335137 AN	32
29cbe68c JB	33	/*
	34	* A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
	35	* before timing out. This way it will remain ACTIVE and no data frames
	36	* will be unnecessarily held in the pending queue.
	37	*/
	38	#define MESH_PATH_REFRESH_TIME 1000
	39	#define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)
	40
	41	/* Default maximum number of established plinks per interface */
	42	#define MESH_MAX_ESTAB_PLINKS 32
	43
	44	#define MESH_MAX_PREQ_RETRIES 4
	45
d299a1f2	46	#define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50
29cbe68c	47
9bdbf04d MP	48	#define MESH_DEFAULT_BEACON_INTERVAL 1000 /* in 1024 us units (=TUs) */
9bdbf04d MP	49	#define MESH_DEFAULT_DTIM_PERIOD 2
3b1c5a53	50	#define MESH_DEFAULT_AWAKE_WINDOW 10 /* in 1024 us units (=TUs) */
9bdbf04d	51
29cbe68c JB	52	const struct mesh_config default_mesh_config = {
	53	.dot11MeshRetryTimeout = MESH_RET_T,
	54	.dot11MeshConfirmTimeout = MESH_CONF_T,
	55	.dot11MeshHoldingTimeout = MESH_HOLD_T,
	56	.dot11MeshMaxRetries = MESH_MAX_RETR,
	57	.dot11MeshTTL = MESH_TTL,
	58	.element_ttl = MESH_DEFAULT_ELEMENT_TTL,
	59	.auto_open_plinks = true,
	60	.dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
d299a1f2	61	.dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX,
29cbe68c JB	62	.dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
29cbe68c JB	63	.dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
dca7e943	64	.dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
29cbe68c JB	65	.dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
	66	.dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
	67	.path_refresh_time = MESH_PATH_REFRESH_TIME,
	68	.min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
0507e159	69	.dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
16dd7267	70	.dot11MeshGateAnnouncementProtocol = false,
94f90656	71	.dot11MeshForwarding = true,
55335137	72	.rssi_threshold = MESH_RSSI_THRESHOLD,
70c33eaa	73	.ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED,
ac1073a6 CYY	74	.dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT,
ac1073a6 CYY	75	.dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL,
728b19e5	76	.dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL,
3b1c5a53 MP	77	.power_mode = NL80211_MESH_POWER_ACTIVE,
3b1c5a53 MP	78	.dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW,
8e7c0538	79	.plink_timeout = MESH_DEFAULT_PLINK_TIMEOUT,
29cbe68c JB	80	};
29cbe68c JB	81
c80d545d	82	const struct mesh_setup default_mesh_setup = {
cc1d2806	83	/* cfg80211_join_mesh() will pick a channel if needed */
d299a1f2	84	.sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
c80d545d JC	85	.path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
c80d545d JC	86	.path_metric = IEEE80211_PATH_METRIC_AIRTIME,
6e16d90b	87	.auth_id = 0, /* open */
581a8b0f JC	88	.ie = NULL,
581a8b0f JC	89	.ie_len = 0,
5cff5e01	90	.is_secure = false,
bb2798d4	91	.user_mpm = false,
9bdbf04d MP	92	.beacon_interval = MESH_DEFAULT_BEACON_INTERVAL,
9bdbf04d MP	93	.dtim_period = MESH_DEFAULT_DTIM_PERIOD,
c80d545d	94	};
29cbe68c JB	95
	96	int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
	97	struct net_device *dev,
cc1d2806	98	struct mesh_setup *setup,
29cbe68c JB	99	const struct mesh_config *conf)
	100	{
	101	struct wireless_dev *wdev = dev->ieee80211_ptr;
29cbe68c JB	102	int err;
	103
	104	BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
	105
	106	ASSERT_WDEV_LOCK(wdev);
	107
	108	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
	109	return -EOPNOTSUPP;
	110
15d5dda6 JC	111	if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
	112	setup->is_secure)
	113	return -EOPNOTSUPP;
	114
29cbe68c JB	115	if (wdev->mesh_id_len)
	116	return -EALREADY;
	117
c80d545d	118	if (!setup->mesh_id_len)
29cbe68c JB	119	return -EINVAL;
	120
	121	if (!rdev->ops->join_mesh)
	122	return -EOPNOTSUPP;
	123
683b6d3b	124	if (!setup->chandef.chan) {
cc1d2806	125	/* if no channel explicitly given, use preset channel */
683b6d3b	126	setup->chandef = wdev->preset_chandef;
cc1d2806 JB	127	}
cc1d2806 JB	128
683b6d3b	129	if (!setup->chandef.chan) {
cc1d2806	130	/* if we don't have that either, use the first usable channel */
57fbcce3	131	enum nl80211_band band;
cc1d2806	132
57fbcce3	133	for (band = 0; band < NUM_NL80211_BANDS; band++) {
cc1d2806 JB	134	struct ieee80211_supported_band *sband;
	135	struct ieee80211_channel *chan;
	136	int i;
	137
	138	sband = rdev->wiphy.bands[band];
	139	if (!sband)
	140	continue;
	141
	142	for (i = 0; i < sband->n_channels; i++) {
	143	chan = &sband->channels[i];
8fe02e16	144	if (chan->flags & (IEEE80211_CHAN_NO_IR \|
cc1d2806 JB	145	IEEE80211_CHAN_DISABLED \|
	146	IEEE80211_CHAN_RADAR))
	147	continue;
683b6d3b	148	setup->chandef.chan = chan;
cc1d2806 JB	149	break;
	150	}
	151
683b6d3b	152	if (setup->chandef.chan)
cc1d2806 JB	153	break;
	154	}
	155
	156	/* no usable channel ... */
683b6d3b	157	if (!setup->chandef.chan)
cc1d2806 JB	158	return -EINVAL;
cc1d2806 JB	159
da29d2a5 MP	160	setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
da29d2a5 MP	161	setup->chandef.center_freq1 = setup->chandef.chan->center_freq;
cc1d2806 JB	162	}
cc1d2806 JB	163
ffb3cf30 AN	164	/*
	165	* check if basic rates are available otherwise use mandatory rates as
	166	* basic rates
	167	*/
	168	if (!setup->basic_rates) {
74608aca	169	enum nl80211_bss_scan_width scan_width;
ffb3cf30 AN	170	struct ieee80211_supported_band *sband =
ffb3cf30 AN	171	rdev->wiphy.bands[setup->chandef.chan->band];
74608aca SW	172	scan_width = cfg80211_chandef_to_scan_width(&setup->chandef);
	173	setup->basic_rates = ieee80211_mandatory_rates(sband,
	174	scan_width);
ffb3cf30 AN	175	}
ffb3cf30 AN	176
174e0cd2 IP	177	if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef,
174e0cd2 IP	178	NL80211_IFTYPE_MESH_POINT))
cc1d2806 JB	179	return -EINVAL;
cc1d2806 JB	180
e35e4d28	181	err = rdev_join_mesh(rdev, dev, conf, setup);
29cbe68c	182	if (!err) {
c80d545d JC	183	memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
c80d545d JC	184	wdev->mesh_id_len = setup->mesh_id_len;
9e0e2961	185	wdev->chandef = setup->chandef;
29cbe68c JB	186	}
	187
	188	return err;
	189	}
	190
	191	int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
	192	struct net_device *dev,
cc1d2806	193	struct mesh_setup *setup,
29cbe68c JB	194	const struct mesh_config *conf)
	195	{
	196	struct wireless_dev *wdev = dev->ieee80211_ptr;
	197	int err;
	198
	199	wdev_lock(wdev);
c80d545d	200	err = __cfg80211_join_mesh(rdev, dev, setup, conf);
29cbe68c JB	201	wdev_unlock(wdev);
	202
	203	return err;
	204	}
	205
683b6d3b JB	206	int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
	207	struct wireless_dev *wdev,
	208	struct cfg80211_chan_def *chandef)
cc1d2806	209	{
f4489ebe	210	int err;
cc1d2806 JB	211
	212	/*
	213	* Workaround for libertas (only!), it puts the interface
	214	* into mesh mode but doesn't implement join_mesh. Instead,
	215	* it is configured via sysfs and then joins the mesh when
	216	* you set the channel. Note that the libertas mesh isn't
	217	* compatible with 802.11 mesh.
	218	*/
e8c9bd5b	219	if (rdev->ops->libertas_set_mesh_channel) {
3d9d1d66	220	if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
e8c9bd5b	221	return -EINVAL;
cc1d2806 JB	222
	223	if (!netif_running(wdev->netdev))
	224	return -ENETDOWN;
f4489ebe	225
e35e4d28	226	err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev,
683b6d3b	227	chandef->chan);
f4489ebe	228	if (!err)
9e0e2961	229	wdev->chandef = *chandef;
f4489ebe MK	230
f4489ebe MK	231	return err;
cc1d2806 JB	232	}
	233
	234	if (wdev->mesh_id_len)
	235	return -EBUSY;
	236
683b6d3b	237	wdev->preset_chandef = *chandef;
cc1d2806 JB	238	return 0;
	239	}
	240
f04c2203 MK	241	int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
f04c2203 MK	242	struct net_device *dev)
29cbe68c JB	243	{
	244	struct wireless_dev *wdev = dev->ieee80211_ptr;
	245	int err;
	246
	247	ASSERT_WDEV_LOCK(wdev);
	248
	249	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
	250	return -EOPNOTSUPP;
	251
	252	if (!rdev->ops->leave_mesh)
	253	return -EOPNOTSUPP;
	254
	255	if (!wdev->mesh_id_len)
	256	return -ENOTCONN;
	257
e35e4d28	258	err = rdev_leave_mesh(rdev, dev);
f4489ebe	259	if (!err) {
29cbe68c	260	wdev->mesh_id_len = 0;
9e0e2961	261	memset(&wdev->chandef, 0, sizeof(wdev->chandef));
fa9ffc74	262	rdev_set_qos_map(rdev, dev, NULL);
f4489ebe MK	263	}
f4489ebe MK	264
29cbe68c JB	265	return err;
	266	}
	267
	268	int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
	269	struct net_device *dev)
	270	{
	271	struct wireless_dev *wdev = dev->ieee80211_ptr;
	272	int err;
	273
	274	wdev_lock(wdev);
	275	err = __cfg80211_leave_mesh(rdev, dev);
	276	wdev_unlock(wdev);
	277
	278	return err;
	279	}