net/mac80211/mesh.h - kernel/msm-4.19 - Gitiles

 /*
  * 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
  * @mean_chain_len: maximum average length for the hash buckets' list, if it is
  *	reached, the table will grow
  * @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;
 	int mean_chain_len;
 	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);
 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 ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local);

 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 void
 ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local) {}
 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 */
	/*
	* 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
	* @mean_chain_len: maximum average length for the hash buckets' list, if it is
	* reached, the table will grow
	* @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;
	int mean_chain_len;
	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);
	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 ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local);

	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 void
	ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local) {}
	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 */