[deliverable/linux.git] / net / mac80211 / mesh.h

/*
 * Copyright (c) 2008, 2009 open80211s Ltd.
 * Authors:    Luis Carlos Cobo <luisca@cozybit.com>
 *             Javier Cardona <javier@cozybit.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef IEEE80211S_H
#define IEEE80211S_H

#include <linux/types.h>
#include <linux/jhash.h>
#include "ieee80211_i.h"


/* Data structures */

/**
 * enum mesh_path_flags - mac80211 mesh path flags
 *
 *
 *
 * @MESH_PATH_ACTIVE: the mesh path can be used for forwarding
 * @MESH_PATH_RESOLVING: the discovery process is running for this mesh path
 * @MESH_PATH_SN_VALID: the mesh path contains a valid destination sequence
 *	number
 * @MESH_PATH_FIXED: the mesh path has been manually set and should not be
 *	modified
 * @MESH_PATH_RESOLVED: the mesh path can has been resolved
 * @MESH_PATH_REQ_QUEUED: there is an unsent path request for this destination
 *	already queued up, waiting for the discovery process to start.
 *
 * MESH_PATH_RESOLVED is used by the mesh path timer to
 * decide when to stop or cancel the mesh path discovery.
 */
enum mesh_path_flags {
	MESH_PATH_ACTIVE =	BIT(0),
	MESH_PATH_RESOLVING =	BIT(1),
	MESH_PATH_SN_VALID =	BIT(2),
	MESH_PATH_FIXED	=	BIT(3),
	MESH_PATH_RESOLVED =	BIT(4),
	MESH_PATH_REQ_QUEUED =	BIT(5),
};

/**
 * enum mesh_deferred_task_flags - mac80211 mesh deferred tasks
 *
 *
 *
 * @MESH_WORK_HOUSEKEEPING: run the periodic mesh housekeeping tasks
 * @MESH_WORK_GROW_MPATH_TABLE: the mesh path table is full and needs
 * to grow.
 * @MESH_WORK_GROW_MPP_TABLE: the mesh portals table is full and needs to
 * grow
 * @MESH_WORK_ROOT: the mesh root station needs to send a frame
 * @MESH_WORK_DRIFT_ADJUST: time to compensate for clock drift relative to other
 * mesh nodes
 * @MESH_WORK_MBSS_CHANGED: rebuild beacon and notify driver of BSS changes
 */
enum mesh_deferred_task_flags {
	MESH_WORK_HOUSEKEEPING,
	MESH_WORK_GROW_MPATH_TABLE,
	MESH_WORK_GROW_MPP_TABLE,
	MESH_WORK_ROOT,
	MESH_WORK_DRIFT_ADJUST,
	MESH_WORK_MBSS_CHANGED,
};

/**
 * struct mesh_path - mac80211 mesh path structure
 *
 * @dst: mesh path destination mac address
 * @sdata: mesh subif
 * @next_hop: mesh neighbor to which frames for this destination will be
 *	forwarded
 * @timer: mesh path discovery timer
 * @frame_queue: pending queue for frames sent to this destination while the
 *	path is unresolved
 * @sn: target sequence number
 * @metric: current metric to this destination
 * @hop_count: hops to destination
 * @exp_time: in jiffies, when the path will expire or when it expired
 * @discovery_timeout: timeout (lapse in jiffies) used for the last discovery
 *	retry
 * @discovery_retries: number of discovery retries
 * @flags: mesh path flags, as specified on &enum mesh_path_flags
 * @state_lock: mesh path state lock used to protect changes to the
 * mpath itself.  No need to take this lock when adding or removing
 * an mpath to a hash bucket on a path table.
 * @rann_snd_addr: the RANN sender address
 * @rann_metric: the aggregated path metric towards the root node
 * @last_preq_to_root: Timestamp of last PREQ sent to root
 * @is_root: the destination station of this path is a root node
 * @is_gate: the destination station of this path is a mesh gate
 *
 *
 * The combination of dst and sdata is unique in the mesh path table. Since the
 * next_hop STA is only protected by RCU as well, deleting the STA must also
 * remove/substitute the mesh_path structure and wait until that is no longer
 * reachable before destroying the STA completely.
 */
struct mesh_path {
	u8 dst[ETH_ALEN];
	u8 mpp[ETH_ALEN];	/* used for MPP or MAP */
	struct ieee80211_sub_if_data *sdata;
	struct sta_info __rcu *next_hop;
	struct timer_list timer;
	struct sk_buff_head frame_queue;
	struct rcu_head rcu;
	u32 sn;
	u32 metric;
	u8 hop_count;
	unsigned long exp_time;
	u32 discovery_timeout;
	u8 discovery_retries;
	enum mesh_path_flags flags;
	spinlock_t state_lock;
	u8 rann_snd_addr[ETH_ALEN];
	u32 rann_metric;
	unsigned long last_preq_to_root;
	bool is_root;
	bool is_gate;
};

/**
 * struct mesh_table
 *
 * @hash_buckets: array of hash buckets of the table
 * @hashwlock: array of locks to protect write operations, one per bucket
 * @hash_mask: 2^size_order - 1, used to compute hash idx
 * @hash_rnd: random value used for hash computations
 * @entries: number of entries in the table
 * @free_node: function to free nodes of the table
 * @copy_node: function to copy nodes of the table
 * @size_order: determines size of the table, there will be 2^size_order hash
 *	buckets
 * @known_gates: list of known mesh gates and their mpaths by the station. The
 * gate's mpath may or may not be resolved and active.
 *
 * rcu_head: RCU head to free the table
 */
struct mesh_table {
	/* Number of buckets will be 2^N */
	struct hlist_head *hash_buckets;
	spinlock_t *hashwlock;		/* One per bucket, for add/del */
	unsigned int hash_mask;		/* (2^size_order) - 1 */
	__u32 hash_rnd;			/* Used for hash generation */
	atomic_t entries;		/* Up to MAX_MESH_NEIGHBOURS */
	void (*free_node) (struct hlist_node *p, bool free_leafs);
	int (*copy_node) (struct hlist_node *p, struct mesh_table *newtbl);
	int size_order;
	struct hlist_head *known_gates;
	spinlock_t gates_lock;

	struct rcu_head rcu_head;
};

/* Recent multicast cache */
/* RMC_BUCKETS must be a power of 2, maximum 256 */
#define RMC_BUCKETS		256
#define RMC_QUEUE_MAX_LEN	4
#define RMC_TIMEOUT		(3 * HZ)

/**
 * struct rmc_entry - entry in the Recent Multicast Cache
 *
 * @seqnum: mesh sequence number of the frame
 * @exp_time: expiration time of the entry, in jiffies
 * @sa: source address of the frame
 *
 * The Recent Multicast Cache keeps track of the latest multicast frames that
 * have been received by a mesh interface and discards received multicast frames
 * that are found in the cache.
 */
struct rmc_entry {
	struct list_head list;
	u32 seqnum;
	unsigned long exp_time;
	u8 sa[ETH_ALEN];
};

struct mesh_rmc {
	struct list_head bucket[RMC_BUCKETS];
	u32 idx_mask;
};

#define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)

#define MESH_PATH_EXPIRE (600 * HZ)

/* Default maximum number of plinks per interface */
#define MESH_MAX_PLINKS		256

/* Maximum number of paths per interface */
#define MESH_MAX_MPATHS		1024

/* Number of frames buffered per destination for unresolved destinations */
#define MESH_FRAME_QUEUE_LEN	10

/* Public interfaces */
/* Various */
int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
				  const u8 *da, const u8 *sa);
unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211s_hdr *meshhdr,
				       const char *addr4or5, const char *addr6);
int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
		   const u8 *addr, struct ieee80211s_hdr *mesh_hdr);
bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
			struct ieee802_11_elems *ie);
void mesh_ids_set_default(struct ieee80211_if_mesh *mesh);
int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
			 struct sk_buff *skb);
int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata,
		       struct sk_buff *skb);
int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata,
		    struct sk_buff *skb);
int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
			struct sk_buff *skb);
int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
		       struct sk_buff *skb);
int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
			struct sk_buff *skb);
int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
			struct sk_buff *skb);
int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
			 struct sk_buff *skb);
void mesh_rmc_free(struct ieee80211_sub_if_data *sdata);
int mesh_rmc_init(struct ieee80211_sub_if_data *sdata);
void ieee80211s_init(void);
void ieee80211s_update_metric(struct ieee80211_local *local,
			      struct sta_info *sta, struct sk_buff *skb);
void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata);
int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata);
void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata);
void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh);
const struct ieee80211_mesh_sync_ops *ieee80211_mesh_sync_ops_get(u8 method);
/* wrapper for ieee80211_bss_info_change_notify() */
void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
				       u32 changed);

/* mesh power save */
u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata);
u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta,
				   enum nl80211_mesh_power_mode pm);
void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata,
				   struct sta_info *sta,
				   struct ieee80211_hdr *hdr);
void ieee80211_mps_sta_status_update(struct sta_info *sta);
void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
				    struct ieee80211_hdr *hdr);
void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta,
				    bool tx, bool acked);
void ieee80211_mps_frame_release(struct sta_info *sta,
				 struct ieee802_11_elems *elems);

/* Mesh paths */
int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata,
			struct sk_buff *skb);
int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata,
			 struct sk_buff *skb);
void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata);
struct mesh_path *mesh_path_lookup(struct ieee80211_sub_if_data *sdata,
				   const u8 *dst);
struct mesh_path *mpp_path_lookup(struct ieee80211_sub_if_data *sdata,
				  const u8 *dst);
int mpp_path_add(struct ieee80211_sub_if_data *sdata,
		 const u8 *dst, const u8 *mpp);
struct mesh_path *
mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx);
struct mesh_path *
mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx);
void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop);
void mesh_path_expire(struct ieee80211_sub_if_data *sdata);
void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
			    struct ieee80211_mgmt *mgmt, size_t len);
struct mesh_path *
mesh_path_add(struct ieee80211_sub_if_data *sdata, const u8 *dst);

int mesh_path_add_gate(struct mesh_path *mpath);
int mesh_path_send_to_gates(struct mesh_path *mpath);
int mesh_gate_num(struct ieee80211_sub_if_data *sdata);

/* Mesh plinks */
void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
			   u8 *hw_addr, struct ieee802_11_elems *ie);
bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie);
u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata);
void mesh_plink_broken(struct sta_info *sta);
u32 mesh_plink_deactivate(struct sta_info *sta);
u32 mesh_plink_open(struct sta_info *sta);
u32 mesh_plink_block(struct sta_info *sta);
void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
			 struct ieee80211_mgmt *mgmt, size_t len,
			 struct ieee80211_rx_status *rx_status);
void mesh_sta_cleanup(struct sta_info *sta);

/* Private interfaces */
/* Mesh tables */
void mesh_mpath_table_grow(void);
void mesh_mpp_table_grow(void);
/* Mesh paths */
int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata,
		       u8 ttl, const u8 *target, u32 target_sn,
		       u16 target_rcode, const u8 *ra);
void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta);
void mesh_path_flush_pending(struct mesh_path *mpath);
void mesh_path_tx_pending(struct mesh_path *mpath);
int mesh_pathtbl_init(void);
void mesh_pathtbl_unregister(void);
int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr);
void mesh_path_timer(unsigned long data);
void mesh_path_flush_by_nexthop(struct sta_info *sta);
void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata,
			     struct sk_buff *skb);
void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata);

bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt);
extern int mesh_paths_generation;
extern int mpp_paths_generation;

#ifdef CONFIG_MAC80211_MESH
static inline
u32 mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata)
{
	atomic_inc(&sdata->u.mesh.estab_plinks);
	return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON;
}

static inline
u32 mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata)
{
	atomic_dec(&sdata->u.mesh.estab_plinks);
	return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON;
}

static inline int mesh_plink_free_count(struct ieee80211_sub_if_data *sdata)
{
	return sdata->u.mesh.mshcfg.dot11MeshMaxPeerLinks -
	       atomic_read(&sdata->u.mesh.estab_plinks);
}

static inline bool mesh_plink_availables(struct ieee80211_sub_if_data *sdata)
{
	return (min_t(long, mesh_plink_free_count(sdata),
		   MESH_MAX_PLINKS - sdata->local->num_sta)) > 0;
}

static inline void mesh_path_activate(struct mesh_path *mpath)
{
	mpath->flags |= MESH_PATH_ACTIVE | MESH_PATH_RESOLVED;
}

static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata)
{
	return sdata->u.mesh.mesh_pp_id == IEEE80211_PATH_PROTOCOL_HWMP;
}

void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata);
void mesh_sync_adjust_tbtt(struct ieee80211_sub_if_data *sdata);
void ieee80211s_stop(void);
#else
static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata)
{ return false; }
static inline void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata)
{}
static inline void ieee80211s_stop(void) {}
#endif

#endif /* IEEE80211S_H */
Commit	Line	Data
	1	/*
	2	* Copyright (c) 2008, 2009 open80211s Ltd.
	3	* Authors: Luis Carlos Cobo <luisca@cozybit.com>
	4	* Javier Cardona <javier@cozybit.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#ifndef IEEE80211S_H
	12	#define IEEE80211S_H
	13
	14	#include <linux/types.h>
	15	#include <linux/jhash.h>
	16	#include "ieee80211_i.h"
	17
	18
	19	/* Data structures */
	20
	21	/**
	22	* enum mesh_path_flags - mac80211 mesh path flags
	23	*
	24	*
	25	*
	26	* @MESH_PATH_ACTIVE: the mesh path can be used for forwarding
	27	* @MESH_PATH_RESOLVING: the discovery process is running for this mesh path
	28	* @MESH_PATH_SN_VALID: the mesh path contains a valid destination sequence
	29	* number
	30	* @MESH_PATH_FIXED: the mesh path has been manually set and should not be
	31	* modified
	32	* @MESH_PATH_RESOLVED: the mesh path can has been resolved
	33	* @MESH_PATH_REQ_QUEUED: there is an unsent path request for this destination
	34	* already queued up, waiting for the discovery process to start.
	35	*
	36	* MESH_PATH_RESOLVED is used by the mesh path timer to
	37	* decide when to stop or cancel the mesh path discovery.
	38	*/
	39	enum mesh_path_flags {
	40	MESH_PATH_ACTIVE = BIT(0),
	41	MESH_PATH_RESOLVING = BIT(1),
	42	MESH_PATH_SN_VALID = BIT(2),
	43	MESH_PATH_FIXED = BIT(3),
	44	MESH_PATH_RESOLVED = BIT(4),
	45	MESH_PATH_REQ_QUEUED = BIT(5),
	46	};
	47
	48	/**
	49	* enum mesh_deferred_task_flags - mac80211 mesh deferred tasks
	50	*
	51	*
	52	*
	53	* @MESH_WORK_HOUSEKEEPING: run the periodic mesh housekeeping tasks
	54	* @MESH_WORK_GROW_MPATH_TABLE: the mesh path table is full and needs
	55	* to grow.
	56	* @MESH_WORK_GROW_MPP_TABLE: the mesh portals table is full and needs to
	57	* grow
	58	* @MESH_WORK_ROOT: the mesh root station needs to send a frame
	59	* @MESH_WORK_DRIFT_ADJUST: time to compensate for clock drift relative to other
	60	* mesh nodes
	61	* @MESH_WORK_MBSS_CHANGED: rebuild beacon and notify driver of BSS changes
	62	*/
	63	enum mesh_deferred_task_flags {
	64	MESH_WORK_HOUSEKEEPING,
	65	MESH_WORK_GROW_MPATH_TABLE,
	66	MESH_WORK_GROW_MPP_TABLE,
	67	MESH_WORK_ROOT,
	68	MESH_WORK_DRIFT_ADJUST,
	69	MESH_WORK_MBSS_CHANGED,
	70	};
	71
	72	/**
	73	* struct mesh_path - mac80211 mesh path structure
	74	*
	75	* @dst: mesh path destination mac address
	76	* @sdata: mesh subif
	77	* @next_hop: mesh neighbor to which frames for this destination will be
	78	* forwarded
	79	* @timer: mesh path discovery timer
	80	* @frame_queue: pending queue for frames sent to this destination while the
	81	* path is unresolved
	82	* @sn: target sequence number
	83	* @metric: current metric to this destination
	84	* @hop_count: hops to destination
	85	* @exp_time: in jiffies, when the path will expire or when it expired
	86	* @discovery_timeout: timeout (lapse in jiffies) used for the last discovery
	87	* retry
	88	* @discovery_retries: number of discovery retries
	89	* @flags: mesh path flags, as specified on &enum mesh_path_flags
	90	* @state_lock: mesh path state lock used to protect changes to the
	91	* mpath itself. No need to take this lock when adding or removing
	92	* an mpath to a hash bucket on a path table.
	93	* @rann_snd_addr: the RANN sender address
	94	* @rann_metric: the aggregated path metric towards the root node
	95	* @last_preq_to_root: Timestamp of last PREQ sent to root
	96	* @is_root: the destination station of this path is a root node
	97	* @is_gate: the destination station of this path is a mesh gate
	98	*
	99	*
	100	* The combination of dst and sdata is unique in the mesh path table. Since the
	101	* next_hop STA is only protected by RCU as well, deleting the STA must also
	102	* remove/substitute the mesh_path structure and wait until that is no longer
	103	* reachable before destroying the STA completely.
	104	*/
	105	struct mesh_path {
	106	u8 dst[ETH_ALEN];
	107	u8 mpp[ETH_ALEN]; /* used for MPP or MAP */
	108	struct ieee80211_sub_if_data *sdata;
	109	struct sta_info __rcu *next_hop;
	110	struct timer_list timer;
	111	struct sk_buff_head frame_queue;
	112	struct rcu_head rcu;
	113	u32 sn;
	114	u32 metric;
	115	u8 hop_count;
	116	unsigned long exp_time;
	117	u32 discovery_timeout;
	118	u8 discovery_retries;
	119	enum mesh_path_flags flags;
	120	spinlock_t state_lock;
	121	u8 rann_snd_addr[ETH_ALEN];
	122	u32 rann_metric;
	123	unsigned long last_preq_to_root;
	124	bool is_root;
	125	bool is_gate;
	126	};
	127
	128	/**
	129	* struct mesh_table
	130	*
	131	* @hash_buckets: array of hash buckets of the table
	132	* @hashwlock: array of locks to protect write operations, one per bucket
	133	* @hash_mask: 2^size_order - 1, used to compute hash idx
	134	* @hash_rnd: random value used for hash computations
	135	* @entries: number of entries in the table
	136	* @free_node: function to free nodes of the table
	137	* @copy_node: function to copy nodes of the table
	138	* @size_order: determines size of the table, there will be 2^size_order hash
	139	* buckets
	140	* @known_gates: list of known mesh gates and their mpaths by the station. The
	141	* gate's mpath may or may not be resolved and active.
	142	*
	143	* rcu_head: RCU head to free the table
	144	*/
	145	struct mesh_table {
	146	/* Number of buckets will be 2^N */
	147	struct hlist_head *hash_buckets;
	148	spinlock_t hashwlock; / One per bucket, for add/del */
	149	unsigned int hash_mask; /* (2^size_order) - 1 */
	150	__u32 hash_rnd; /* Used for hash generation */
	151	atomic_t entries; /* Up to MAX_MESH_NEIGHBOURS */
	152	void (free_node) (struct hlist_node p, bool free_leafs);
	153	int (copy_node) (struct hlist_node p, struct mesh_table *newtbl);
	154	int size_order;
	155	struct hlist_head *known_gates;
	156	spinlock_t gates_lock;
	157
	158	struct rcu_head rcu_head;
	159	};
	160
	161	/* Recent multicast cache */
	162	/* RMC_BUCKETS must be a power of 2, maximum 256 */
	163	#define RMC_BUCKETS 256
	164	#define RMC_QUEUE_MAX_LEN 4
	165	#define RMC_TIMEOUT (3 * HZ)
	166
	167	/**
	168	* struct rmc_entry - entry in the Recent Multicast Cache
	169	*
	170	* @seqnum: mesh sequence number of the frame
	171	* @exp_time: expiration time of the entry, in jiffies
	172	* @sa: source address of the frame
	173	*
	174	* The Recent Multicast Cache keeps track of the latest multicast frames that
	175	* have been received by a mesh interface and discards received multicast frames
	176	* that are found in the cache.
	177	*/
	178	struct rmc_entry {
	179	struct list_head list;
	180	u32 seqnum;
	181	unsigned long exp_time;
	182	u8 sa[ETH_ALEN];
	183	};
	184
	185	struct mesh_rmc {
	186	struct list_head bucket[RMC_BUCKETS];
	187	u32 idx_mask;
	188	};
	189
	190	#define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
	191
	192	#define MESH_PATH_EXPIRE (600 * HZ)
	193
	194	/* Default maximum number of plinks per interface */
	195	#define MESH_MAX_PLINKS 256
	196
	197	/* Maximum number of paths per interface */
	198	#define MESH_MAX_MPATHS 1024
	199
	200	/* Number of frames buffered per destination for unresolved destinations */
	201	#define MESH_FRAME_QUEUE_LEN 10
	202
	203	/* Public interfaces */
	204	/* Various */
	205	int ieee80211_fill_mesh_addresses(struct ieee80211_hdr hdr, __le16 fc,
	206	const u8 da, const u8 sa);
	207	unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
	208	struct ieee80211s_hdr *meshhdr,
	209	const char addr4or5, const char addr6);
	210	int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
	211	const u8 addr, struct ieee80211s_hdr mesh_hdr);
	212	bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
	213	struct ieee802_11_elems *ie);
	214	void mesh_ids_set_default(struct ieee80211_if_mesh *mesh);
	215	int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
	216	struct sk_buff *skb);
	217	int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata,
	218	struct sk_buff *skb);
	219	int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata,
	220	struct sk_buff *skb);
	221	int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
	222	struct sk_buff *skb);
	223	int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
	224	struct sk_buff *skb);
	225	int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
	226	struct sk_buff *skb);
	227	int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
	228	struct sk_buff *skb);
	229	int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
	230	struct sk_buff *skb);
	231	void mesh_rmc_free(struct ieee80211_sub_if_data *sdata);
	232	int mesh_rmc_init(struct ieee80211_sub_if_data *sdata);
	233	void ieee80211s_init(void);
	234	void ieee80211s_update_metric(struct ieee80211_local *local,
	235	struct sta_info sta, struct sk_buff skb);
	236	void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata);
	237	int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata);
	238	void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata);
	239	void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh);
	240	const struct ieee80211_mesh_sync_ops *ieee80211_mesh_sync_ops_get(u8 method);
	241	/* wrapper for ieee80211_bss_info_change_notify() */
	242	void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
	243	u32 changed);
	244
	245	/* mesh power save */
	246	u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata);
	247	u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta,
	248	enum nl80211_mesh_power_mode pm);
	249	void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata,
	250	struct sta_info *sta,
	251	struct ieee80211_hdr *hdr);
	252	void ieee80211_mps_sta_status_update(struct sta_info *sta);
	253	void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
	254	struct ieee80211_hdr *hdr);
	255	void ieee80211_mpsp_trigger_process(u8 qc, struct sta_info sta,
	256	bool tx, bool acked);
	257	void ieee80211_mps_frame_release(struct sta_info *sta,
	258	struct ieee802_11_elems *elems);
	259
	260	/* Mesh paths */
	261	int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata,
	262	struct sk_buff *skb);
	263	int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata,
	264	struct sk_buff *skb);
	265	void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata);
	266	struct mesh_path mesh_path_lookup(struct ieee80211_sub_if_data sdata,
	267	const u8 *dst);
	268	struct mesh_path mpp_path_lookup(struct ieee80211_sub_if_data sdata,
	269	const u8 *dst);
	270	int mpp_path_add(struct ieee80211_sub_if_data *sdata,
	271	const u8 dst, const u8 mpp);
	272	struct mesh_path *
	273	mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx);
	274	struct mesh_path *
	275	mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx);
	276	void mesh_path_fix_nexthop(struct mesh_path mpath, struct sta_info next_hop);
	277	void mesh_path_expire(struct ieee80211_sub_if_data *sdata);
	278	void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
	279	struct ieee80211_mgmt *mgmt, size_t len);
	280	struct mesh_path *
	281	mesh_path_add(struct ieee80211_sub_if_data sdata, const u8 dst);
	282
	283	int mesh_path_add_gate(struct mesh_path *mpath);
	284	int mesh_path_send_to_gates(struct mesh_path *mpath);
	285	int mesh_gate_num(struct ieee80211_sub_if_data *sdata);
	286
	287	/* Mesh plinks */
	288	void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
	289	u8 hw_addr, struct ieee802_11_elems ie);
	290	bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie);
	291	u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata);
	292	void mesh_plink_broken(struct sta_info *sta);
	293	u32 mesh_plink_deactivate(struct sta_info *sta);
	294	u32 mesh_plink_open(struct sta_info *sta);
	295	u32 mesh_plink_block(struct sta_info *sta);
	296	void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
	297	struct ieee80211_mgmt *mgmt, size_t len,
	298	struct ieee80211_rx_status *rx_status);
	299	void mesh_sta_cleanup(struct sta_info *sta);
	300
	301	/* Private interfaces */
	302	/* Mesh tables */
	303	void mesh_mpath_table_grow(void);
	304	void mesh_mpp_table_grow(void);
	305	/* Mesh paths */
	306	int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata,
	307	u8 ttl, const u8 *target, u32 target_sn,
	308	u16 target_rcode, const u8 *ra);
	309	void mesh_path_assign_nexthop(struct mesh_path mpath, struct sta_info sta);
	310	void mesh_path_flush_pending(struct mesh_path *mpath);
	311	void mesh_path_tx_pending(struct mesh_path *mpath);
	312	int mesh_pathtbl_init(void);
	313	void mesh_pathtbl_unregister(void);
	314	int mesh_path_del(struct ieee80211_sub_if_data sdata, const u8 addr);
	315	void mesh_path_timer(unsigned long data);
	316	void mesh_path_flush_by_nexthop(struct sta_info *sta);
	317	void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata,
	318	struct sk_buff *skb);
	319	void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata);
	320
	321	bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt);
	322	extern int mesh_paths_generation;
	323	extern int mpp_paths_generation;
	324
	325	#ifdef CONFIG_MAC80211_MESH
	326	static inline
	327	u32 mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata)
	328	{
	329	atomic_inc(&sdata->u.mesh.estab_plinks);
	330	return mesh_accept_plinks_update(sdata) \| BSS_CHANGED_BEACON;
	331	}
	332
	333	static inline
	334	u32 mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata)
	335	{
	336	atomic_dec(&sdata->u.mesh.estab_plinks);
	337	return mesh_accept_plinks_update(sdata) \| BSS_CHANGED_BEACON;
	338	}
	339
	340	static inline int mesh_plink_free_count(struct ieee80211_sub_if_data *sdata)
	341	{
	342	return sdata->u.mesh.mshcfg.dot11MeshMaxPeerLinks -
	343	atomic_read(&sdata->u.mesh.estab_plinks);
	344	}
	345
	346	static inline bool mesh_plink_availables(struct ieee80211_sub_if_data *sdata)
	347	{
	348	return (min_t(long, mesh_plink_free_count(sdata),
	349	MESH_MAX_PLINKS - sdata->local->num_sta)) > 0;
	350	}
	351
	352	static inline void mesh_path_activate(struct mesh_path *mpath)
	353	{
	354	mpath->flags \|= MESH_PATH_ACTIVE \| MESH_PATH_RESOLVED;
	355	}
	356
	357	static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata)
	358	{
	359	return sdata->u.mesh.mesh_pp_id == IEEE80211_PATH_PROTOCOL_HWMP;
	360	}
	361
	362	void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata);
	363	void mesh_sync_adjust_tbtt(struct ieee80211_sub_if_data *sdata);
	364	void ieee80211s_stop(void);
	365	#else
	366	static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata)
	367	{ return false; }
	368	static inline void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata)
	369	{}
	370	static inline void ieee80211s_stop(void) {}
	371	#endif
	372
	373	#endif /* IEEE80211S_H */