/* * Copyright (c) 2008 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 <asm/unaligned.h> #include "ieee80211_i.h" /* Data structures */ /** * enum mesh_path_flags - mac80211 mesh path flags * * * * @MESH_PATH_ACTIVE: the mesh path is can be used for forwarding * @MESH_PATH_RESOLVED: the discovery process is running for this mesh path * @MESH_PATH_DSN_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_RESOLVED and MESH_PATH_DELETE are 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_DSN_VALID = BIT(2), MESH_PATH_FIXED = BIT(3), MESH_PATH_RESOLVED = BIT(4), }; /** * struct mesh_path - mac80211 mesh path structure * * @dst: mesh path destination mac address * @dev: mesh path device * @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 * @dsn: destination sequence number of the destination * @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 pat state lock * * * The combination of dst and dev 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]; struct net_device *dev; struct sta_info *next_hop; struct timer_list timer; struct sk_buff_head frame_queue; struct rcu_head rcu; u32 dsn; u32 metric; u8 hop_count; unsigned long exp_time; u32 discovery_timeout; u8 discovery_retries; enum mesh_path_flags flags; spinlock_t state_lock; }; /** * 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: fuction 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 */ 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); void (*copy_node) (struct hlist_node *p, struct mesh_table *newtbl); int size_order; int mean_chain_len; }; /* 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 rmc_entry bucket[RMC_BUCKETS]; u32 idx_mask; }; /* Mesh IEs constants */ #define MESH_CFG_LEN 19 /* * MESH_CFG_COMP_LEN Includes: * - Active path selection protocol ID. * - Active path selection metric ID. * - Congestion control mode identifier. * - Channel precedence. * Does not include mesh capabilities, which may vary across nodes in the same * mesh */ #define MESH_CFG_CMP_LEN 17 /* Default values, timeouts in ms */ #define MESH_TTL 5 #define MESH_MAX_RETR 3 #define MESH_RET_T 100 #define MESH_CONF_T 100 #define MESH_HOLD_T 100 #define MESH_PATH_TIMEOUT 5000 /* Minimum interval between two consecutive PREQs originated by the same * interface */ #define MESH_PREQ_MIN_INT 10 #define MESH_DIAM_TRAVERSAL_TIME 50 /* Paths will be refreshed if they are closer than PATH_REFRESH_TIME to their * expiration */ #define MESH_PATH_REFRESH_TIME 1000 #define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME) #define MESH_MAX_PREQ_RETRIES 4 #define MESH_PATH_EXPIRE (600 * HZ) /* Default maximum number of established plinks per interface */ #define MESH_MAX_ESTAB_PLINKS 32 /* Default maximum number of plinks per interface */ #define MESH_MAX_PLINKS 256 /* Maximum number of paths per interface */ #define MESH_MAX_MPATHS 1024 /* Pending ANA approval */ #define PLINK_CATEGORY 30 #define MESH_PATH_SEL_CATEGORY 32 /* Mesh Header Flags */ #define IEEE80211S_FLAGS_AE 0x3 /* Public interfaces */ /* Various */ u8 mesh_id_hash(u8 *mesh_id, int mesh_id_len); int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr); int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr, struct ieee80211_sub_if_data *sdata); int mesh_rmc_check(u8 *addr, struct ieee80211s_hdr *mesh_hdr, struct net_device *dev); bool mesh_matches_local(struct ieee802_11_elems *ie, struct net_device *dev); void mesh_ids_set_default(struct ieee80211_if_sta *sta); void mesh_mgmt_ies_add(struct sk_buff *skb, struct net_device *dev); void mesh_rmc_free(struct net_device *dev); int mesh_rmc_init(struct net_device *dev); void ieee80211s_init(void); void ieee80211s_stop(void); void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata); /* Mesh paths */ int mesh_nexthop_lookup(u8 *next_hop, struct sk_buff *skb, struct net_device *dev); void mesh_path_start_discovery(struct net_device *dev); struct mesh_path *mesh_path_lookup(u8 *dst, struct net_device *dev); struct mesh_path *mesh_path_lookup_by_idx(int idx, struct net_device *dev); void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop); void mesh_path_expire(struct net_device *dev); void mesh_path_flush(struct net_device *dev); void mesh_rx_path_sel_frame(struct net_device *dev, struct ieee80211_mgmt *mgmt, size_t len); int mesh_path_add(u8 *dst, struct net_device *dev); /* Mesh plinks */ void mesh_neighbour_update(u8 *hw_addr, u64 rates, struct net_device *dev, bool add); bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie, struct net_device *dev); void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata); void mesh_plink_broken(struct sta_info *sta); void mesh_plink_deactivate(struct sta_info *sta); int mesh_plink_open(struct sta_info *sta); int mesh_plink_close(struct sta_info *sta); void mesh_plink_block(struct sta_info *sta); void mesh_rx_plink_frame(struct net_device *dev, struct ieee80211_mgmt *mgmt, size_t len, struct ieee80211_rx_status *rx_status); /* Private interfaces */ /* Mesh tables */ struct mesh_table *mesh_table_alloc(int size_order); void mesh_table_free(struct mesh_table *tbl, bool free_leafs); struct mesh_table *mesh_table_grow(struct mesh_table *tbl); u32 mesh_table_hash(u8 *addr, struct net_device *dev, struct mesh_table *tbl); /* Mesh paths */ int mesh_path_error_tx(u8 *dest, __le32 dest_dsn, u8 *ra, struct net_device *dev); 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(u8 *addr, struct net_device *dev); void mesh_path_timer(unsigned long data); void mesh_path_flush_by_nexthop(struct sta_info *sta); void mesh_path_discard_frame(struct sk_buff *skb, struct net_device *dev); #ifdef CONFIG_MAC80211_MESH extern int mesh_allocated; static inline int mesh_plink_free_count(struct ieee80211_sub_if_data *sdata) { return sdata->u.sta.mshcfg.dot11MeshMaxPeerLinks - atomic_read(&sdata->u.sta.mshstats.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; } #define for_each_mesh_entry(x, p, node, i) \ for (i = 0; i <= x->hash_mask; i++) \ hlist_for_each_entry_rcu(node, p, &x->hash_buckets[i], list) #else #define mesh_allocated 0 #endif #define MESH_PREQ(skb) (skb->cb + 30) #endif /* IEEE80211S_H */