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Diffstat (limited to 'kernel/net/mac80211/mesh.h')
| -rw-r--r-- | kernel/net/mac80211/mesh.h | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/kernel/net/mac80211/mesh.h b/kernel/net/mac80211/mesh.h new file mode 100644 index 000000000..50c8473cf --- /dev/null +++ b/kernel/net/mac80211/mesh.h @@ -0,0 +1,376 @@ +/* + * 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); +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 */ |