[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"

/* 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_DIAM_TRAVERSAL_TIME 50

/*
 * 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


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,
	.dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
	.dot11MeshHWMPpreqMinInterval = MESH_PREQ_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,
};

const struct mesh_setup default_mesh_setup = {
	.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,
			 const 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;

	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,
		       const 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;
}

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
	23	#define MESH_DIAM_TRAVERSAL_TIME 50
	24
	25	/*
	26	* A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds
	27	* before timing out. This way it will remain ACTIVE and no data frames
	28	* will be unnecessarily held in the pending queue.
	29	*/
	30	#define MESH_PATH_REFRESH_TIME 1000
	31	#define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)
	32
	33	/* Default maximum number of established plinks per interface */
	34	#define MESH_MAX_ESTAB_PLINKS 32
	35
	36	#define MESH_MAX_PREQ_RETRIES 4
	37
	38
	39	const struct mesh_config default_mesh_config = {
	40	.dot11MeshRetryTimeout = MESH_RET_T,
	41	.dot11MeshConfirmTimeout = MESH_CONF_T,
	42	.dot11MeshHoldingTimeout = MESH_HOLD_T,
	43	.dot11MeshMaxRetries = MESH_MAX_RETR,
	44	.dot11MeshTTL = MESH_TTL,
	45	.element_ttl = MESH_DEFAULT_ELEMENT_TTL,
	46	.auto_open_plinks = true,
	47	.dot11MeshMaxPeerLinks = MESH_MAX_ESTAB_PLINKS,
	48	.dot11MeshHWMPactivePathTimeout = MESH_PATH_TIMEOUT,
	49	.dot11MeshHWMPpreqMinInterval = MESH_PREQ_MIN_INT,
	50	.dot11MeshHWMPnetDiameterTraversalTime = MESH_DIAM_TRAVERSAL_TIME,
	51	.dot11MeshHWMPmaxPREQretries = MESH_MAX_PREQ_RETRIES,
	52	.path_refresh_time = MESH_PATH_REFRESH_TIME,
	53	.min_discovery_timeout = MESH_MIN_DISCOVERY_TIMEOUT,
0507e159	54	.dot11MeshHWMPRannInterval = MESH_RANN_INTERVAL,
16dd7267	55	.dot11MeshGateAnnouncementProtocol = false,
29cbe68c JB	56	};
29cbe68c JB	57
c80d545d JC	58	const struct mesh_setup default_mesh_setup = {
	59	.path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
	60	.path_metric = IEEE80211_PATH_METRIC_AIRTIME,
581a8b0f JC	61	.ie = NULL,
581a8b0f JC	62	.ie_len = 0,
5cff5e01	63	.is_secure = false,
c80d545d	64	};
29cbe68c JB	65
	66	int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
	67	struct net_device *dev,
c80d545d	68	const struct mesh_setup *setup,
29cbe68c JB	69	const struct mesh_config *conf)
	70	{
	71	struct wireless_dev *wdev = dev->ieee80211_ptr;
29cbe68c JB	72	int err;
	73
	74	BUILD_BUG_ON(IEEE80211_MAX_SSID_LEN != IEEE80211_MAX_MESH_ID_LEN);
	75
	76	ASSERT_WDEV_LOCK(wdev);
	77
	78	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
	79	return -EOPNOTSUPP;
	80
15d5dda6 JC	81	if (!(rdev->wiphy.flags & WIPHY_FLAG_MESH_AUTH) &&
	82	setup->is_secure)
	83	return -EOPNOTSUPP;
	84
29cbe68c JB	85	if (wdev->mesh_id_len)
	86	return -EALREADY;
	87
c80d545d	88	if (!setup->mesh_id_len)
29cbe68c JB	89	return -EINVAL;
	90
	91	if (!rdev->ops->join_mesh)
	92	return -EOPNOTSUPP;
	93
c80d545d	94	err = rdev->ops->join_mesh(&rdev->wiphy, dev, conf, setup);
29cbe68c	95	if (!err) {
c80d545d JC	96	memcpy(wdev->ssid, setup->mesh_id, setup->mesh_id_len);
c80d545d JC	97	wdev->mesh_id_len = setup->mesh_id_len;
29cbe68c JB	98	}
	99
	100	return err;
	101	}
	102
	103	int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
	104	struct net_device *dev,
c80d545d	105	const struct mesh_setup *setup,
29cbe68c JB	106	const struct mesh_config *conf)
	107	{
	108	struct wireless_dev *wdev = dev->ieee80211_ptr;
	109	int err;
	110
	111	wdev_lock(wdev);
c80d545d	112	err = __cfg80211_join_mesh(rdev, dev, setup, conf);
29cbe68c JB	113	wdev_unlock(wdev);
	114
	115	return err;
	116	}
	117
c93b5e71 JC	118	void cfg80211_notify_new_peer_candidate(struct net_device *dev,
	119	const u8 macaddr, const u8 ie, u8 ie_len, gfp_t gfp)
	120	{
	121	struct wireless_dev *wdev = dev->ieee80211_ptr;
	122
	123	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_MESH_POINT))
	124	return;
	125
	126	nl80211_send_new_peer_candidate(wiphy_to_dev(wdev->wiphy), dev,
	127	macaddr, ie, ie_len, gfp);
	128	}
	129	EXPORT_SYMBOL(cfg80211_notify_new_peer_candidate);
	130
29cbe68c JB	131	static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
	132	struct net_device *dev)
	133	{
	134	struct wireless_dev *wdev = dev->ieee80211_ptr;
	135	int err;
	136
	137	ASSERT_WDEV_LOCK(wdev);
	138
	139	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_MESH_POINT)
	140	return -EOPNOTSUPP;
	141
	142	if (!rdev->ops->leave_mesh)
	143	return -EOPNOTSUPP;
	144
	145	if (!wdev->mesh_id_len)
	146	return -ENOTCONN;
	147
	148	err = rdev->ops->leave_mesh(&rdev->wiphy, dev);
	149	if (!err)
	150	wdev->mesh_id_len = 0;
	151	return err;
	152	}
	153
	154	int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
	155	struct net_device *dev)
	156	{
	157	struct wireless_dev *wdev = dev->ieee80211_ptr;
	158	int err;
	159
	160	wdev_lock(wdev);
	161	err = __cfg80211_leave_mesh(rdev, dev);
	162	wdev_unlock(wdev);
	163
	164	return err;
	165	}