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-rw-r--r--kernel/net/mac80211/mesh.h376
1 files changed, 376 insertions, 0 deletions
diff --git a/kernel/net/mac80211/mesh.h b/kernel/net/mac80211/mesh.h
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+++ b/kernel/net/mac80211/mesh.h
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+/*
+ * 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 */