usb: add USB_QUIRK_RESET_RESUME for M-Audio 88es
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / mesh.h
blob249e733362e7b9bf4d48714800ba7da48273832d
1 /*
2 * Copyright (c) 2008, 2009 open80211s Ltd.
3 * Authors: Luis Carlos Cobo <luisca@cozybit.com>
4 * Javier Cardona <javier@cozybit.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
11 #ifndef IEEE80211S_H
12 #define IEEE80211S_H
14 #include <linux/types.h>
15 #include <linux/jhash.h>
16 #include <asm/unaligned.h>
17 #include "ieee80211_i.h"
20 /* Data structures */
22 /**
23 * enum mesh_path_flags - mac80211 mesh path flags
27 * @MESH_PATH_ACTIVE: the mesh path can be used for forwarding
28 * @MESH_PATH_RESOLVING: the discovery process is running for this mesh path
29 * @MESH_PATH_SN_VALID: the mesh path contains a valid destination sequence
30 * number
31 * @MESH_PATH_FIXED: the mesh path has been manually set and should not be
32 * modified
33 * @MESH_PATH_RESOLVED: the mesh path can has been resolved
35 * MESH_PATH_RESOLVED is used by the mesh path timer to
36 * decide when to stop or cancel the mesh path discovery.
38 enum mesh_path_flags {
39 MESH_PATH_ACTIVE = BIT(0),
40 MESH_PATH_RESOLVING = BIT(1),
41 MESH_PATH_SN_VALID = BIT(2),
42 MESH_PATH_FIXED = BIT(3),
43 MESH_PATH_RESOLVED = BIT(4),
46 /**
47 * enum mesh_deferred_task_flags - mac80211 mesh deferred tasks
51 * @MESH_WORK_HOUSEKEEPING: run the periodic mesh housekeeping tasks
52 * @MESH_WORK_GROW_MPATH_TABLE: the mesh path table is full and needs
53 * to grow.
54 * @MESH_WORK_GROW_MPP_TABLE: the mesh portals table is full and needs to
55 * grow
56 * @MESH_WORK_ROOT: the mesh root station needs to send a frame
58 enum mesh_deferred_task_flags {
59 MESH_WORK_HOUSEKEEPING,
60 MESH_WORK_GROW_MPATH_TABLE,
61 MESH_WORK_GROW_MPP_TABLE,
62 MESH_WORK_ROOT,
65 /**
66 * struct mesh_path - mac80211 mesh path structure
68 * @dst: mesh path destination mac address
69 * @sdata: mesh subif
70 * @next_hop: mesh neighbor to which frames for this destination will be
71 * forwarded
72 * @timer: mesh path discovery timer
73 * @frame_queue: pending queue for frames sent to this destination while the
74 * path is unresolved
75 * @sn: target sequence number
76 * @metric: current metric to this destination
77 * @hop_count: hops to destination
78 * @exp_time: in jiffies, when the path will expire or when it expired
79 * @discovery_timeout: timeout (lapse in jiffies) used for the last discovery
80 * retry
81 * @discovery_retries: number of discovery retries
82 * @flags: mesh path flags, as specified on &enum mesh_path_flags
83 * @state_lock: mesh path state lock
86 * The combination of dst and sdata is unique in the mesh path table. Since the
87 * next_hop STA is only protected by RCU as well, deleting the STA must also
88 * remove/substitute the mesh_path structure and wait until that is no longer
89 * reachable before destroying the STA completely.
91 struct mesh_path {
92 u8 dst[ETH_ALEN];
93 u8 mpp[ETH_ALEN]; /* used for MPP or MAP */
94 struct ieee80211_sub_if_data *sdata;
95 struct sta_info __rcu *next_hop;
96 struct timer_list timer;
97 struct sk_buff_head frame_queue;
98 struct rcu_head rcu;
99 u32 sn;
100 u32 metric;
101 u8 hop_count;
102 unsigned long exp_time;
103 u32 discovery_timeout;
104 u8 discovery_retries;
105 enum mesh_path_flags flags;
106 spinlock_t state_lock;
110 * struct mesh_table
112 * @hash_buckets: array of hash buckets of the table
113 * @hashwlock: array of locks to protect write operations, one per bucket
114 * @hash_mask: 2^size_order - 1, used to compute hash idx
115 * @hash_rnd: random value used for hash computations
116 * @entries: number of entries in the table
117 * @free_node: function to free nodes of the table
118 * @copy_node: function to copy nodes of the table
119 * @size_order: determines size of the table, there will be 2^size_order hash
120 * buckets
121 * @mean_chain_len: maximum average length for the hash buckets' list, if it is
122 * reached, the table will grow
123 * rcu_head: RCU head to free the table
125 struct mesh_table {
126 /* Number of buckets will be 2^N */
127 struct hlist_head *hash_buckets;
128 spinlock_t *hashwlock; /* One per bucket, for add/del */
129 unsigned int hash_mask; /* (2^size_order) - 1 */
130 __u32 hash_rnd; /* Used for hash generation */
131 atomic_t entries; /* Up to MAX_MESH_NEIGHBOURS */
132 void (*free_node) (struct hlist_node *p, bool free_leafs);
133 int (*copy_node) (struct hlist_node *p, struct mesh_table *newtbl);
134 int size_order;
135 int mean_chain_len;
137 struct rcu_head rcu_head;
140 /* Recent multicast cache */
141 /* RMC_BUCKETS must be a power of 2, maximum 256 */
142 #define RMC_BUCKETS 256
143 #define RMC_QUEUE_MAX_LEN 4
144 #define RMC_TIMEOUT (3 * HZ)
147 * struct rmc_entry - entry in the Recent Multicast Cache
149 * @seqnum: mesh sequence number of the frame
150 * @exp_time: expiration time of the entry, in jiffies
151 * @sa: source address of the frame
153 * The Recent Multicast Cache keeps track of the latest multicast frames that
154 * have been received by a mesh interface and discards received multicast frames
155 * that are found in the cache.
157 struct rmc_entry {
158 struct list_head list;
159 u32 seqnum;
160 unsigned long exp_time;
161 u8 sa[ETH_ALEN];
164 struct mesh_rmc {
165 struct rmc_entry bucket[RMC_BUCKETS];
166 u32 idx_mask;
170 #define MESH_DEFAULT_BEACON_INTERVAL 1000 /* in 1024 us units */
172 #define MESH_PATH_EXPIRE (600 * HZ)
174 /* Default maximum number of plinks per interface */
175 #define MESH_MAX_PLINKS 256
177 /* Maximum number of paths per interface */
178 #define MESH_MAX_MPATHS 1024
180 /* Pending ANA approval */
181 #define MESH_PATH_SEL_ACTION 0
183 /* PERR reason codes */
184 #define PEER_RCODE_UNSPECIFIED 11
185 #define PERR_RCODE_NO_ROUTE 12
186 #define PERR_RCODE_DEST_UNREACH 13
188 /* Public interfaces */
189 /* Various */
190 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
191 const u8 *da, const u8 *sa);
192 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
193 struct ieee80211_sub_if_data *sdata, char *addr4or5,
194 char *addr6);
195 int mesh_rmc_check(u8 *addr, struct ieee80211s_hdr *mesh_hdr,
196 struct ieee80211_sub_if_data *sdata);
197 bool mesh_matches_local(struct ieee802_11_elems *ie,
198 struct ieee80211_sub_if_data *sdata);
199 void mesh_ids_set_default(struct ieee80211_if_mesh *mesh);
200 void mesh_mgmt_ies_add(struct sk_buff *skb,
201 struct ieee80211_sub_if_data *sdata);
202 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata);
203 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata);
204 void ieee80211s_init(void);
205 void ieee80211s_update_metric(struct ieee80211_local *local,
206 struct sta_info *stainfo, struct sk_buff *skb);
207 void ieee80211s_stop(void);
208 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata);
209 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata);
210 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata);
211 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh);
213 /* Mesh paths */
214 int mesh_nexthop_lookup(struct sk_buff *skb,
215 struct ieee80211_sub_if_data *sdata);
216 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata);
217 struct mesh_path *mesh_path_lookup(u8 *dst,
218 struct ieee80211_sub_if_data *sdata);
219 struct mesh_path *mpp_path_lookup(u8 *dst,
220 struct ieee80211_sub_if_data *sdata);
221 int mpp_path_add(u8 *dst, u8 *mpp, struct ieee80211_sub_if_data *sdata);
222 struct mesh_path *mesh_path_lookup_by_idx(int idx,
223 struct ieee80211_sub_if_data *sdata);
224 void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop);
225 void mesh_path_expire(struct ieee80211_sub_if_data *sdata);
226 void mesh_path_flush(struct ieee80211_sub_if_data *sdata);
227 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
228 struct ieee80211_mgmt *mgmt, size_t len);
229 int mesh_path_add(u8 *dst, struct ieee80211_sub_if_data *sdata);
230 /* Mesh plinks */
231 void mesh_neighbour_update(u8 *hw_addr, u32 rates,
232 struct ieee80211_sub_if_data *sdata,
233 struct ieee802_11_elems *ie);
234 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie);
235 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata);
236 void mesh_plink_broken(struct sta_info *sta);
237 void mesh_plink_deactivate(struct sta_info *sta);
238 int mesh_plink_open(struct sta_info *sta);
239 void mesh_plink_block(struct sta_info *sta);
240 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
241 struct ieee80211_mgmt *mgmt, size_t len,
242 struct ieee80211_rx_status *rx_status);
244 /* Private interfaces */
245 /* Mesh tables */
246 void mesh_mpath_table_grow(void);
247 void mesh_mpp_table_grow(void);
248 /* Mesh paths */
249 int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn, __le16 target_rcode,
250 const u8 *ra, struct ieee80211_sub_if_data *sdata);
251 void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta);
252 void mesh_path_flush_pending(struct mesh_path *mpath);
253 void mesh_path_tx_pending(struct mesh_path *mpath);
254 int mesh_pathtbl_init(void);
255 void mesh_pathtbl_unregister(void);
256 int mesh_path_del(u8 *addr, struct ieee80211_sub_if_data *sdata);
257 void mesh_path_timer(unsigned long data);
258 void mesh_path_flush_by_nexthop(struct sta_info *sta);
259 void mesh_path_discard_frame(struct sk_buff *skb,
260 struct ieee80211_sub_if_data *sdata);
261 void mesh_path_quiesce(struct ieee80211_sub_if_data *sdata);
262 void mesh_path_restart(struct ieee80211_sub_if_data *sdata);
263 void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata);
265 extern int mesh_paths_generation;
267 #ifdef CONFIG_MAC80211_MESH
268 extern int mesh_allocated;
270 static inline int mesh_plink_free_count(struct ieee80211_sub_if_data *sdata)
272 return sdata->u.mesh.mshcfg.dot11MeshMaxPeerLinks -
273 atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
276 static inline bool mesh_plink_availables(struct ieee80211_sub_if_data *sdata)
278 return (min_t(long, mesh_plink_free_count(sdata),
279 MESH_MAX_PLINKS - sdata->local->num_sta)) > 0;
282 static inline void mesh_path_activate(struct mesh_path *mpath)
284 mpath->flags |= MESH_PATH_ACTIVE | MESH_PATH_RESOLVED;
287 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata)
289 return sdata->u.mesh.mesh_pp_id == IEEE80211_PATH_PROTOCOL_HWMP;
292 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local);
294 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata);
295 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata);
296 void mesh_plink_quiesce(struct sta_info *sta);
297 void mesh_plink_restart(struct sta_info *sta);
298 #else
299 #define mesh_allocated 0
300 static inline void
301 ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local) {}
302 static inline void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
304 static inline void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
306 static inline void mesh_plink_quiesce(struct sta_info *sta) {}
307 static inline void mesh_plink_restart(struct sta_info *sta) {}
308 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata)
309 { return false; }
310 #endif
312 #endif /* IEEE80211S_H */