292 строки
9.4 KiB
C
292 строки
9.4 KiB
C
/*
|
|
* 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);
|
|
int (*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 */
|