[deliverable/linux.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

/*
 * 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,
};

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 ieee80211_band band;

		for (band = 0; band < IEEE80211_NUM_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_IBSS |
						   IEEE80211_CHAN_PASSIVE_SCAN |
						   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;
	}

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

	err = cfg80211_can_use_chan(rdev, wdev, setup->chandef.chan,
				    CHAN_MODE_SHARED);
	if (err)
		return err;

	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->channel = setup->chandef.chan;
	}

	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 = cfg80211_can_use_chan(rdev, wdev, chandef->chan,
					    CHAN_MODE_SHARED);
		if (err)
			return err;

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

		return err;
	}

	if (wdev->mesh_id_len)
		return -EBUSY;

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

static 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;
		wdev->channel = 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
29cbe68c JB	21
	22	/*
	23	* Minimum interval between two consecutive PREQs originated by the same
	24	* interface
	25	*/
	26	#define MESH_PREQ_MIN_INT 10
dca7e943	27	#define MESH_PERR_MIN_INT 100
29cbe68c JB	28	#define MESH_DIAM_TRAVERSAL_TIME 50
29cbe68c JB	29
55335137 AN	30	#define MESH_RSSI_THRESHOLD 0
55335137 AN	31
29cbe68c JB	32	/*
	33	* A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
	34	* before timing out. This way it will remain ACTIVE and no data frames
	35	* will be unnecessarily held in the pending queue.
	36	*/
	37	#define MESH_PATH_REFRESH_TIME 1000
	38	#define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)
	39
	40	/* Default maximum number of established plinks per interface */
	41	#define MESH_MAX_ESTAB_PLINKS 32
	42
	43	#define MESH_MAX_PREQ_RETRIES 4
	44
d299a1f2	45	#define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50
29cbe68c	46
9bdbf04d MP	47	#define MESH_DEFAULT_BEACON_INTERVAL 1000 /* in 1024 us units (=TUs) */
9bdbf04d MP	48	#define MESH_DEFAULT_DTIM_PERIOD 2
3b1c5a53	49	#define MESH_DEFAULT_AWAKE_WINDOW 10 /* in 1024 us units (=TUs) */
9bdbf04d	50
29cbe68c JB	51	const struct mesh_config default_mesh_config = {
	52	.dot11MeshRetryTimeout = MESH_RET_T,
	53	.dot11MeshConfirmTimeout = MESH_CONF_T,
	54	.dot11MeshHoldingTimeout = MESH_HOLD_T,
	55	.dot11MeshMaxRetries = MESH_MAX_RETR,
	56	.dot11MeshTTL = MESH_TTL,
	57	.element_ttl = MESH_DEFAULT_ELEMENT_TTL,
	58	.auto_open_plinks = true,
	59	.dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
d299a1f2	60	.dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX,
29cbe68c JB	61	.dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
29cbe68c JB	62	.dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
dca7e943	63	.dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
29cbe68c JB	64	.dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
	65	.dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
	66	.path_refresh_time = MESH_PATH_REFRESH_TIME,
	67	.min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
0507e159	68	.dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
16dd7267	69	.dot11MeshGateAnnouncementProtocol = false,
94f90656	70	.dot11MeshForwarding = true,
55335137	71	.rssi_threshold = MESH_RSSI_THRESHOLD,
70c33eaa	72	.ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED,
ac1073a6 CYY	73	.dot11MeshHWMPactivePathToRootTimeout = MESH_PATH_TO_ROOT_TIMEOUT,
ac1073a6 CYY	74	.dot11MeshHWMProotInterval = MESH_ROOT_INTERVAL,
728b19e5	75	.dot11MeshHWMPconfirmationInterval = MESH_ROOT_CONFIRMATION_INTERVAL,
3b1c5a53 MP	76	.power_mode = NL80211_MESH_POWER_ACTIVE,
3b1c5a53 MP	77	.dot11MeshAwakeWindowDuration = MESH_DEFAULT_AWAKE_WINDOW,
29cbe68c JB	78	};
29cbe68c JB	79
c80d545d	80	const struct mesh_setup default_mesh_setup = {
cc1d2806	81	/* cfg80211_join_mesh() will pick a channel if needed */
d299a1f2	82	.sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
c80d545d JC	83	.path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
c80d545d JC	84	.path_metric = IEEE80211_PATH_METRIC_AIRTIME,
6e16d90b	85	.auth_id = 0, /* open */
581a8b0f JC	86	.ie = NULL,
581a8b0f JC	87	.ie_len = 0,
5cff5e01	88	.is_secure = false,
bb2798d4	89	.user_mpm = false,
9bdbf04d MP	90	.beacon_interval = MESH_DEFAULT_BEACON_INTERVAL,
9bdbf04d MP	91	.dtim_period = MESH_DEFAULT_DTIM_PERIOD,
c80d545d	92	};
29cbe68c JB	93
	94	int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
	95	struct net_device *dev,
cc1d2806	96	struct mesh_setup *setup,
29cbe68c JB	97	const struct mesh_config *conf)
	98	{
	99	struct wireless_dev *wdev = dev->ieee80211_ptr;
29cbe68c JB	100	int err;
	101
	102	BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
	103
	104	ASSERT_WDEV_LOCK(wdev);
	105
	106	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
	107	return -EOPNOTSUPP;
	108
15d5dda6 JC	109	if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
	110	setup->is_secure)
	111	return -EOPNOTSUPP;
	112
29cbe68c JB	113	if (wdev->mesh_id_len)
	114	return -EALREADY;
	115
c80d545d	116	if (!setup->mesh_id_len)
29cbe68c JB	117	return -EINVAL;
	118
	119	if (!rdev->ops->join_mesh)
	120	return -EOPNOTSUPP;
	121
683b6d3b	122	if (!setup->chandef.chan) {
cc1d2806	123	/* if no channel explicitly given, use preset channel */
683b6d3b	124	setup->chandef = wdev->preset_chandef;
cc1d2806 JB	125	}
cc1d2806 JB	126
683b6d3b	127	if (!setup->chandef.chan) {
cc1d2806 JB	128	/* if we don't have that either, use the first usable channel */
	129	enum ieee80211_band band;
	130
	131	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
	132	struct ieee80211_supported_band *sband;
	133	struct ieee80211_channel *chan;
	134	int i;
	135
	136	sband = rdev->wiphy.bands[band];
	137	if (!sband)
	138	continue;
	139
	140	for (i = 0; i < sband->n_channels; i++) {
	141	chan = &sband->channels[i];
	142	if (chan->flags & (IEEE80211_CHAN_NO_IBSS \|
	143	IEEE80211_CHAN_PASSIVE_SCAN \|
	144	IEEE80211_CHAN_DISABLED \|
	145	IEEE80211_CHAN_RADAR))
	146	continue;
683b6d3b	147	setup->chandef.chan = chan;
cc1d2806 JB	148	break;
	149	}
	150
683b6d3b	151	if (setup->chandef.chan)
cc1d2806 JB	152	break;
	153	}
	154
	155	/* no usable channel ... */
683b6d3b	156	if (!setup->chandef.chan)
cc1d2806 JB	157	return -EINVAL;
cc1d2806 JB	158
da29d2a5 MP	159	setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
da29d2a5 MP	160	setup->chandef.center_freq1 = setup->chandef.chan->center_freq;
cc1d2806 JB	161	}
cc1d2806 JB	162
683b6d3b	163	if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef))
cc1d2806 JB	164	return -EINVAL;
cc1d2806 JB	165
683b6d3b	166	err = cfg80211_can_use_chan(rdev, wdev, setup->chandef.chan,
e4e32459 MK	167	CHAN_MODE_SHARED);
	168	if (err)
	169	return err;
	170
e35e4d28	171	err = rdev_join_mesh(rdev, dev, conf, setup);
29cbe68c	172	if (!err) {
c80d545d JC	173	memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
c80d545d JC	174	wdev->mesh_id_len = setup->mesh_id_len;
683b6d3b	175	wdev->channel = setup->chandef.chan;
29cbe68c JB	176	}
	177
	178	return err;
	179	}
	180
	181	int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
	182	struct net_device *dev,
cc1d2806	183	struct mesh_setup *setup,
29cbe68c JB	184	const struct mesh_config *conf)
	185	{
	186	struct wireless_dev *wdev = dev->ieee80211_ptr;
	187	int err;
	188
	189	wdev_lock(wdev);
c80d545d	190	err = __cfg80211_join_mesh(rdev, dev, setup, conf);
29cbe68c JB	191	wdev_unlock(wdev);
	192
	193	return err;
	194	}
	195
683b6d3b JB	196	int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
	197	struct wireless_dev *wdev,
	198	struct cfg80211_chan_def *chandef)
cc1d2806	199	{
f4489ebe	200	int err;
cc1d2806 JB	201
	202	/*
	203	* Workaround for libertas (only!), it puts the interface
	204	* into mesh mode but doesn't implement join_mesh. Instead,
	205	* it is configured via sysfs and then joins the mesh when
	206	* you set the channel. Note that the libertas mesh isn't
	207	* compatible with 802.11 mesh.
	208	*/
e8c9bd5b	209	if (rdev->ops->libertas_set_mesh_channel) {
3d9d1d66	210	if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
e8c9bd5b	211	return -EINVAL;
cc1d2806 JB	212
	213	if (!netif_running(wdev->netdev))
	214	return -ENETDOWN;
f4489ebe	215
683b6d3b	216	err = cfg80211_can_use_chan(rdev, wdev, chandef->chan,
e4e32459 MK	217	CHAN_MODE_SHARED);
	218	if (err)
	219	return err;
	220
e35e4d28	221	err = rdev_libertas_set_mesh_channel(rdev, wdev->netdev,
683b6d3b	222	chandef->chan);
f4489ebe	223	if (!err)
683b6d3b	224	wdev->channel = chandef->chan;
f4489ebe MK	225
f4489ebe MK	226	return err;
cc1d2806 JB	227	}
	228
	229	if (wdev->mesh_id_len)
	230	return -EBUSY;
	231
683b6d3b	232	wdev->preset_chandef = *chandef;
cc1d2806 JB	233	return 0;
	234	}
	235
29cbe68c JB	236	static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
	237	struct net_device *dev)
	238	{
	239	struct wireless_dev *wdev = dev->ieee80211_ptr;
	240	int err;
	241
	242	ASSERT_WDEV_LOCK(wdev);
	243
	244	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
	245	return -EOPNOTSUPP;
	246
	247	if (!rdev->ops->leave_mesh)
	248	return -EOPNOTSUPP;
	249
	250	if (!wdev->mesh_id_len)
	251	return -ENOTCONN;
	252
e35e4d28	253	err = rdev_leave_mesh(rdev, dev);
f4489ebe	254	if (!err) {
29cbe68c	255	wdev->mesh_id_len = 0;
f4489ebe MK	256	wdev->channel = NULL;
	257	}
	258
29cbe68c JB	259	return err;
	260	}
	261
	262	int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
	263	struct net_device *dev)
	264	{
	265	struct wireless_dev *wdev = dev->ieee80211_ptr;
	266	int err;
	267
	268	wdev_lock(wdev);
	269	err = __cfg80211_leave_mesh(rdev, dev);
	270	wdev_unlock(wdev);
	271
	272	return err;
	273	}