[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"

/* 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

/*
 * 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

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,
};

const struct mesh_setup default_mesh_setup = {
	/* cfg80211_join_mesh() will pick a channel if needed */
	.channel = NULL,
	.channel_type = NL80211_CHAN_NO_HT,
	.sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
	.path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
	.path_metric = IEEE80211_PATH_METRIC_AIRTIME,
	.ie = NULL,
	.ie_len = 0,
	.is_secure = false,
};

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->channel) {
		/* if no channel explicitly given, use preset channel */
		setup->channel = wdev->preset_chan;
		setup->channel_type = wdev->preset_chantype;
	}

	if (!setup->channel) {
		/* 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->channel = chan;
				break;
			}

			if (setup->channel)
				break;
		}

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

		setup->channel_type = NL80211_CHAN_NO_HT;
	}

	if (!cfg80211_can_beacon_sec_chan(&rdev->wiphy, setup->channel,
					  setup->channel_type))
		return -EINVAL;

	err = rdev->ops->join_mesh(&rdev->wiphy, dev, conf, setup);
	if (!err) {
		memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
		wdev->mesh_id_len = setup->mesh_id_len;
	}

	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_freq(struct cfg80211_registered_device *rdev,
			   struct wireless_dev *wdev, int freq,
			   enum nl80211_channel_type channel_type)
{
	struct ieee80211_channel *channel;

	channel = rdev_freq_to_chan(rdev, freq, channel_type);
	if (!channel || !cfg80211_can_beacon_sec_chan(&rdev->wiphy,
						      channel,
						      channel_type)) {
		return -EINVAL;
	}

	/*
	 * 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 (channel_type != NL80211_CHAN_NO_HT)
			return -EINVAL;

		if (!netif_running(wdev->netdev))
			return -ENETDOWN;
		return rdev->ops->libertas_set_mesh_channel(&rdev->wiphy,
							    wdev->netdev,
							    channel);
	}

	if (wdev->mesh_id_len)
		return -EBUSY;

	wdev->preset_chan = channel;
	wdev->preset_chantype = channel_type;
	return 0;
}

void cfg80211_notify_new_peer_candidate(struct net_device *dev,
		const u8 *macaddr, const u8* ie, u8 ie_len, gfp_t gfp)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;

	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_MESH_POINT))
		return;

	nl80211_send_new_peer_candidate(wiphy_to_dev(wdev->wiphy), dev,
			macaddr, ie, ie_len, gfp);
}
EXPORT_SYMBOL(cfg80211_notify_new_peer_candidate);

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->ops->leave_mesh(&rdev->wiphy, dev);
	if (!err)
		wdev->mesh_id_len = 0;
	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 JB	5	#include "core.h"
	6
	7	/* Default values, timeouts in ms */
	8	#define MESH_TTL 31
	9	#define MESH_DEFAULT_ELEMENT_TTL 31
	10	#define MESH_MAX_RETR 3
	11	#define MESH_RET_T 100
	12	#define MESH_CONF_T 100
	13	#define MESH_HOLD_T 100
	14
	15	#define MESH_PATH_TIMEOUT 5000
0507e159	16	#define MESH_RANN_INTERVAL 5000
29cbe68c JB	17
	18	/*
	19	* Minimum interval between two consecutive PREQs originated by the same
	20	* interface
	21	*/
	22	#define MESH_PREQ_MIN_INT 10
dca7e943	23	#define MESH_PERR_MIN_INT 100
29cbe68c JB	24	#define MESH_DIAM_TRAVERSAL_TIME 50
29cbe68c JB	25
55335137 AN	26	#define MESH_RSSI_THRESHOLD 0
55335137 AN	27
29cbe68c JB	28	/*
	29	* A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
	30	* before timing out. This way it will remain ACTIVE and no data frames
	31	* will be unnecessarily held in the pending queue.
	32	*/
	33	#define MESH_PATH_REFRESH_TIME 1000
	34	#define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)
	35
	36	/* Default maximum number of established plinks per interface */
	37	#define MESH_MAX_ESTAB_PLINKS 32
	38
	39	#define MESH_MAX_PREQ_RETRIES 4
	40
d299a1f2	41	#define MESH_SYNC_NEIGHBOR_OFFSET_MAX 50
29cbe68c JB	42
	43	const struct mesh_config default_mesh_config = {
	44	.dot11MeshRetryTimeout = MESH_RET_T,
	45	.dot11MeshConfirmTimeout = MESH_CONF_T,
	46	.dot11MeshHoldingTimeout = MESH_HOLD_T,
	47	.dot11MeshMaxRetries = MESH_MAX_RETR,
	48	.dot11MeshTTL = MESH_TTL,
	49	.element_ttl = MESH_DEFAULT_ELEMENT_TTL,
	50	.auto_open_plinks = true,
	51	.dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
d299a1f2	52	.dot11MeshNbrOffsetMaxNeighbor = MESH_SYNC_NEIGHBOR_OFFSET_MAX,
29cbe68c JB	53	.dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
29cbe68c JB	54	.dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
dca7e943	55	.dot11MeshHWMPperrMinInterval = MESH_PERR_MIN_INT,
29cbe68c JB	56	.dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
	57	.dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
	58	.path_refresh_time = MESH_PATH_REFRESH_TIME,
	59	.min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
0507e159	60	.dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
16dd7267	61	.dot11MeshGateAnnouncementProtocol = false,
94f90656	62	.dot11MeshForwarding = true,
55335137	63	.rssi_threshold = MESH_RSSI_THRESHOLD,
70c33eaa	64	.ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED,
29cbe68c JB	65	};
29cbe68c JB	66
c80d545d	67	const struct mesh_setup default_mesh_setup = {
cc1d2806 JB	68	/* cfg80211_join_mesh() will pick a channel if needed */
	69	.channel = NULL,
	70	.channel_type = NL80211_CHAN_NO_HT,
d299a1f2	71	.sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
c80d545d JC	72	.path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
c80d545d JC	73	.path_metric = IEEE80211_PATH_METRIC_AIRTIME,
581a8b0f JC	74	.ie = NULL,
581a8b0f JC	75	.ie_len = 0,
5cff5e01	76	.is_secure = false,
c80d545d	77	};
29cbe68c JB	78
	79	int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
	80	struct net_device *dev,
cc1d2806	81	struct mesh_setup *setup,
29cbe68c JB	82	const struct mesh_config *conf)
	83	{
	84	struct wireless_dev *wdev = dev->ieee80211_ptr;
29cbe68c JB	85	int err;
	86
	87	BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
	88
	89	ASSERT_WDEV_LOCK(wdev);
	90
	91	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
	92	return -EOPNOTSUPP;
	93
15d5dda6 JC	94	if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
	95	setup->is_secure)
	96	return -EOPNOTSUPP;
	97
29cbe68c JB	98	if (wdev->mesh_id_len)
	99	return -EALREADY;
	100
c80d545d	101	if (!setup->mesh_id_len)
29cbe68c JB	102	return -EINVAL;
	103
	104	if (!rdev->ops->join_mesh)
	105	return -EOPNOTSUPP;
	106
cc1d2806 JB	107	if (!setup->channel) {
	108	/* if no channel explicitly given, use preset channel */
	109	setup->channel = wdev->preset_chan;
	110	setup->channel_type = wdev->preset_chantype;
	111	}
	112
	113	if (!setup->channel) {
	114	/* if we don't have that either, use the first usable channel */
	115	enum ieee80211_band band;
	116
	117	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
	118	struct ieee80211_supported_band *sband;
	119	struct ieee80211_channel *chan;
	120	int i;
	121
	122	sband = rdev->wiphy.bands[band];
	123	if (!sband)
	124	continue;
	125
	126	for (i = 0; i < sband->n_channels; i++) {
	127	chan = &sband->channels[i];
	128	if (chan->flags & (IEEE80211_CHAN_NO_IBSS \|
	129	IEEE80211_CHAN_PASSIVE_SCAN \|
	130	IEEE80211_CHAN_DISABLED \|
	131	IEEE80211_CHAN_RADAR))
	132	continue;
	133	setup->channel = chan;
	134	break;
	135	}
	136
	137	if (setup->channel)
	138	break;
	139	}
	140
	141	/* no usable channel ... */
	142	if (!setup->channel)
	143	return -EINVAL;
	144
	145	setup->channel_type = NL80211_CHAN_NO_HT;
	146	}
	147
	148	if (!cfg80211_can_beacon_sec_chan(&rdev->wiphy, setup->channel,
	149	setup->channel_type))
	150	return -EINVAL;
	151
c80d545d	152	err = rdev->ops->join_mesh(&rdev->wiphy, dev, conf, setup);
29cbe68c	153	if (!err) {
c80d545d JC	154	memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
c80d545d JC	155	wdev->mesh_id_len = setup->mesh_id_len;
29cbe68c JB	156	}
	157
	158	return err;
	159	}
	160
	161	int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
	162	struct net_device *dev,
cc1d2806	163	struct mesh_setup *setup,
29cbe68c JB	164	const struct mesh_config *conf)
	165	{
	166	struct wireless_dev *wdev = dev->ieee80211_ptr;
	167	int err;
	168
	169	wdev_lock(wdev);
c80d545d	170	err = __cfg80211_join_mesh(rdev, dev, setup, conf);
29cbe68c JB	171	wdev_unlock(wdev);
	172
	173	return err;
	174	}
	175
cc1d2806 JB	176	int cfg80211_set_mesh_freq(struct cfg80211_registered_device *rdev,
	177	struct wireless_dev *wdev, int freq,
	178	enum nl80211_channel_type channel_type)
	179	{
	180	struct ieee80211_channel *channel;
	181
e8c9bd5b JB	182	channel = rdev_freq_to_chan(rdev, freq, channel_type);
	183	if (!channel \|\| !cfg80211_can_beacon_sec_chan(&rdev->wiphy,
	184	channel,
	185	channel_type)) {
	186	return -EINVAL;
	187	}
	188
cc1d2806 JB	189	/*
	190	* Workaround for libertas (only!), it puts the interface
	191	* into mesh mode but doesn't implement join_mesh. Instead,
	192	* it is configured via sysfs and then joins the mesh when
	193	* you set the channel. Note that the libertas mesh isn't
	194	* compatible with 802.11 mesh.
	195	*/
e8c9bd5b JB	196	if (rdev->ops->libertas_set_mesh_channel) {
	197	if (channel_type != NL80211_CHAN_NO_HT)
	198	return -EINVAL;
cc1d2806 JB	199
	200	if (!netif_running(wdev->netdev))
	201	return -ENETDOWN;
e8c9bd5b JB	202	return rdev->ops->libertas_set_mesh_channel(&rdev->wiphy,
	203	wdev->netdev,
	204	channel);
cc1d2806 JB	205	}
	206
	207	if (wdev->mesh_id_len)
	208	return -EBUSY;
	209
cc1d2806 JB	210	wdev->preset_chan = channel;
	211	wdev->preset_chantype = channel_type;
	212	return 0;
	213	}
	214
c93b5e71 JC	215	void cfg80211_notify_new_peer_candidate(struct net_device *dev,
	216	const u8 macaddr, const u8 ie, u8 ie_len, gfp_t gfp)
	217	{
	218	struct wireless_dev *wdev = dev->ieee80211_ptr;
	219
	220	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_MESH_POINT))
	221	return;
	222
	223	nl80211_send_new_peer_candidate(wiphy_to_dev(wdev->wiphy), dev,
	224	macaddr, ie, ie_len, gfp);
	225	}
	226	EXPORT_SYMBOL(cfg80211_notify_new_peer_candidate);
	227
29cbe68c JB	228	static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
	229	struct net_device *dev)
	230	{
	231	struct wireless_dev *wdev = dev->ieee80211_ptr;
	232	int err;
	233
	234	ASSERT_WDEV_LOCK(wdev);
	235
	236	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
	237	return -EOPNOTSUPP;
	238
	239	if (!rdev->ops->leave_mesh)
	240	return -EOPNOTSUPP;
	241
	242	if (!wdev->mesh_id_len)
	243	return -ENOTCONN;
	244
	245	err = rdev->ops->leave_mesh(&rdev->wiphy, dev);
	246	if (!err)
	247	wdev->mesh_id_len = 0;
	248	return err;
	249	}
	250
	251	int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
	252	struct net_device *dev)
	253	{
	254	struct wireless_dev *wdev = dev->ieee80211_ptr;
	255	int err;
	256
	257	wdev_lock(wdev);
	258	err = __cfg80211_leave_mesh(rdev, dev);
	259	wdev_unlock(wdev);
	260
	261	return err;
	262	}