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Release 4.8 net/mac80211/mesh.h

Directory: net/mac80211
 * Copyright (c) 2008, 2009 open80211s Ltd.
 * Authors:    Luis Carlos Cobo <>
 *             Javier Cardona <>
 * 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_DELETED: the mesh path has been deleted and should no longer
 *      be used
 * 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 {

 * enum mesh_deferred_task_flags - mac80211 mesh deferred tasks
 * @MESH_WORK_HOUSEKEEPING: run the periodic mesh housekeeping tasks
 * @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 {

 * struct mesh_path - mac80211 mesh path structure
 * @dst: mesh path destination mac address
 * @mpp: mesh proxy mac address
 * @rhash: rhashtable list pointer
 * @gate_list: list pointer for known gates list
 * @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
 * @rcu: rcu head for freeing mesh path
 * @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 dst address is unique in the mesh path table. Since the mesh_path is
 * protected by RCU, deleting the next_hop STA must 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 rhash_head rhash;
struct hlist_node gate_list;
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
 * @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.
 * @gates_lock: protects updates to known_gates
 * @rhead: the rhashtable containing struct mesh_paths, keyed by dest addr
 * @entries: number of entries in the table

struct mesh_table {
struct hlist_head known_gates;
spinlock_t gates_lock;
struct rhashtable rhead;
atomic_t entries;		/* Up to MAX_MESH_NEIGHBOURS */

/* Recent multicast cache */
/* RMC_BUCKETS must be a power of 2, maximum 256 */

#define RMC_BUCKETS		256


#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
 * @list: hashtable list pointer
 * 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 hlist_node list;
unsigned long exp_time;
u32 seqnum;
u8 sa[ETH_ALEN];

struct mesh_rmc {
struct hlist_head bucket[RMC_BUCKETS];
u32 idx_mask;


#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 */


/* 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);
void ieee80211_mesh_teardown_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 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(struct ieee80211_sub_if_data *sdata);
void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata);
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);

#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; }


marco porschmarco porsch3093.75%150.00%
jacob minshalljacob minshall26.25%150.00%

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; }


marco porschmarco porsch3093.75%150.00%
jacob minshalljacob minshall26.25%150.00%

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); }


luis carlos cobo rusluis carlos cobo rus3394.29%150.00%
johannes bergjohannes berg25.71%150.00%

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; }


luis carlos cobo rusluis carlos cobo rus3291.43%150.00%
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static inline void mesh_path_activate(struct mesh_path *mpath) { mpath->flags |= MESH_PATH_ACTIVE | MESH_PATH_RESOLVED; }


luis carlos cobo rusluis carlos cobo rus20100.00%1100.00%

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; }


javier cardonajavier cardona23100.00%1100.00%

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; }


javier cardonajavier cardona15100.00%1100.00%

static inline void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata) {}


andrei emeltchenkoandrei emeltchenko11100.00%1100.00%

static inline void ieee80211s_stop(void) {}


johannes bergjohannes berg8100.00%1100.00%

#endif #endif /* IEEE80211S_H */

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Directory: net/mac80211
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