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1 | /* |
2 | * Copyright (c) 2008, 2009 open80211s Ltd. |
3 | * Authors: Luis Carlos Cobo <luisca@cozybit.com> |
4 | * Javier Cardona <javier@cozybit.com> |
5 | * |
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 | */ |
10 | |
11 | #ifndef IEEE80211S_H |
12 | #define IEEE80211S_H |
13 | |
14 | #include <linux/types.h> |
15 | #include <linux/jhash.h> |
16 | #include "ieee80211_i.h" |
17 | |
18 | |
19 | /* Data structures */ |
20 | |
21 | /** |
22 | * enum mesh_path_flags - mac80211 mesh path flags |
23 | * |
24 | * |
25 | * |
26 | * @MESH_PATH_ACTIVE: the mesh path can be used for forwarding |
27 | * @MESH_PATH_RESOLVING: the discovery process is running for this mesh path |
28 | * @MESH_PATH_SN_VALID: the mesh path contains a valid destination sequence |
29 | * number |
30 | * @MESH_PATH_FIXED: the mesh path has been manually set and should not be |
31 | * modified |
32 | * @MESH_PATH_RESOLVED: the mesh path can has been resolved |
33 | * @MESH_PATH_REQ_QUEUED: there is an unsent path request for this destination |
34 | * already queued up, waiting for the discovery process to start. |
35 | * |
36 | * MESH_PATH_RESOLVED is used by the mesh path timer to |
37 | * decide when to stop or cancel the mesh path discovery. |
38 | */ |
39 | enum mesh_path_flags { |
40 | MESH_PATH_ACTIVE = BIT(0), |
41 | MESH_PATH_RESOLVING = BIT(1), |
42 | MESH_PATH_SN_VALID = BIT(2), |
43 | MESH_PATH_FIXED = BIT(3), |
44 | MESH_PATH_RESOLVED = BIT(4), |
45 | MESH_PATH_REQ_QUEUED = BIT(5), |
46 | }; |
47 | |
48 | /** |
49 | * enum mesh_deferred_task_flags - mac80211 mesh deferred tasks |
50 | * |
51 | * |
52 | * |
53 | * @MESH_WORK_HOUSEKEEPING: run the periodic mesh housekeeping tasks |
54 | * @MESH_WORK_GROW_MPATH_TABLE: the mesh path table is full and needs |
55 | * to grow. |
56 | * @MESH_WORK_GROW_MPP_TABLE: the mesh portals table is full and needs to |
57 | * grow |
58 | * @MESH_WORK_ROOT: the mesh root station needs to send a frame |
59 | * @MESH_WORK_DRIFT_ADJUST: time to compensate for clock drift relative to other |
60 | * mesh nodes |
61 | * @MESH_WORK_MBSS_CHANGED: rebuild beacon and notify driver of BSS changes |
62 | */ |
63 | enum mesh_deferred_task_flags { |
64 | MESH_WORK_HOUSEKEEPING, |
65 | MESH_WORK_GROW_MPATH_TABLE, |
66 | MESH_WORK_GROW_MPP_TABLE, |
67 | MESH_WORK_ROOT, |
68 | MESH_WORK_DRIFT_ADJUST, |
69 | MESH_WORK_MBSS_CHANGED, |
70 | }; |
71 | |
72 | /** |
73 | * struct mesh_path - mac80211 mesh path structure |
74 | * |
75 | * @dst: mesh path destination mac address |
76 | * @sdata: mesh subif |
77 | * @next_hop: mesh neighbor to which frames for this destination will be |
78 | * forwarded |
79 | * @timer: mesh path discovery timer |
80 | * @frame_queue: pending queue for frames sent to this destination while the |
81 | * path is unresolved |
82 | * @sn: target sequence number |
83 | * @metric: current metric to this destination |
84 | * @hop_count: hops to destination |
85 | * @exp_time: in jiffies, when the path will expire or when it expired |
86 | * @discovery_timeout: timeout (lapse in jiffies) used for the last discovery |
87 | * retry |
88 | * @discovery_retries: number of discovery retries |
89 | * @flags: mesh path flags, as specified on &enum mesh_path_flags |
90 | * @state_lock: mesh path state lock used to protect changes to the |
91 | * mpath itself. No need to take this lock when adding or removing |
92 | * an mpath to a hash bucket on a path table. |
93 | * @rann_snd_addr: the RANN sender address |
94 | * @rann_metric: the aggregated path metric towards the root node |
95 | * @last_preq_to_root: Timestamp of last PREQ sent to root |
96 | * @is_root: the destination station of this path is a root node |
97 | * @is_gate: the destination station of this path is a mesh gate |
98 | * |
99 | * |
100 | * The combination of dst and sdata is unique in the mesh path table. Since the |
101 | * next_hop STA is only protected by RCU as well, deleting the STA must also |
102 | * remove/substitute the mesh_path structure and wait until that is no longer |
103 | * reachable before destroying the STA completely. |
104 | */ |
105 | struct mesh_path { |
106 | u8 dst[ETH_ALEN]; |
107 | u8 mpp[ETH_ALEN]; /* used for MPP or MAP */ |
108 | struct ieee80211_sub_if_data *sdata; |
109 | struct sta_info __rcu *next_hop; |
110 | struct timer_list timer; |
111 | struct sk_buff_head frame_queue; |
112 | struct rcu_head rcu; |
113 | u32 sn; |
114 | u32 metric; |
115 | u8 hop_count; |
116 | unsigned long exp_time; |
117 | u32 discovery_timeout; |
118 | u8 discovery_retries; |
119 | enum mesh_path_flags flags; |
120 | spinlock_t state_lock; |
121 | u8 rann_snd_addr[ETH_ALEN]; |
122 | u32 rann_metric; |
123 | unsigned long last_preq_to_root; |
124 | bool is_root; |
125 | bool is_gate; |
126 | }; |
127 | |
128 | /** |
129 | * struct mesh_table |
130 | * |
131 | * @hash_buckets: array of hash buckets of the table |
132 | * @hashwlock: array of locks to protect write operations, one per bucket |
133 | * @hash_mask: 2^size_order - 1, used to compute hash idx |
134 | * @hash_rnd: random value used for hash computations |
135 | * @entries: number of entries in the table |
136 | * @free_node: function to free nodes of the table |
137 | * @copy_node: function to copy nodes of the table |
138 | * @size_order: determines size of the table, there will be 2^size_order hash |
139 | * buckets |
140 | * @mean_chain_len: maximum average length for the hash buckets' list, if it is |
141 | * reached, the table will grow |
142 | * @known_gates: list of known mesh gates and their mpaths by the station. The |
143 | * gate's mpath may or may not be resolved and active. |
144 | * |
145 | * rcu_head: RCU head to free the table |
146 | */ |
147 | struct mesh_table { |
148 | /* Number of buckets will be 2^N */ |
149 | struct hlist_head *hash_buckets; |
150 | spinlock_t *hashwlock; /* One per bucket, for add/del */ |
151 | unsigned int hash_mask; /* (2^size_order) - 1 */ |
152 | __u32 hash_rnd; /* Used for hash generation */ |
153 | atomic_t entries; /* Up to MAX_MESH_NEIGHBOURS */ |
154 | void (*free_node) (struct hlist_node *p, bool free_leafs); |
155 | int (*copy_node) (struct hlist_node *p, struct mesh_table *newtbl); |
156 | int size_order; |
157 | int mean_chain_len; |
158 | struct hlist_head *known_gates; |
159 | spinlock_t gates_lock; |
160 | |
161 | struct rcu_head rcu_head; |
162 | }; |
163 | |
164 | /* Recent multicast cache */ |
165 | /* RMC_BUCKETS must be a power of 2, maximum 256 */ |
166 | #define RMC_BUCKETS 256 |
167 | #define RMC_QUEUE_MAX_LEN 4 |
168 | #define RMC_TIMEOUT (3 * HZ) |
169 | |
170 | /** |
171 | * struct rmc_entry - entry in the Recent Multicast Cache |
172 | * |
173 | * @seqnum: mesh sequence number of the frame |
174 | * @exp_time: expiration time of the entry, in jiffies |
175 | * @sa: source address of the frame |
176 | * |
177 | * The Recent Multicast Cache keeps track of the latest multicast frames that |
178 | * have been received by a mesh interface and discards received multicast frames |
179 | * that are found in the cache. |
180 | */ |
181 | struct rmc_entry { |
182 | struct list_head list; |
183 | u32 seqnum; |
184 | unsigned long exp_time; |
185 | u8 sa[ETH_ALEN]; |
186 | }; |
187 | |
188 | struct mesh_rmc { |
189 | struct list_head bucket[RMC_BUCKETS]; |
190 | u32 idx_mask; |
191 | }; |
192 | |
193 | #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ) |
194 | |
195 | #define MESH_PATH_EXPIRE (600 * HZ) |
196 | |
197 | /* Default maximum number of plinks per interface */ |
198 | #define MESH_MAX_PLINKS 256 |
199 | |
200 | /* Maximum number of paths per interface */ |
201 | #define MESH_MAX_MPATHS 1024 |
202 | |
203 | /* Number of frames buffered per destination for unresolved destinations */ |
204 | #define MESH_FRAME_QUEUE_LEN 10 |
205 | |
206 | /* Public interfaces */ |
207 | /* Various */ |
208 | int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, |
209 | const u8 *da, const u8 *sa); |
210 | int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata, |
211 | struct ieee80211s_hdr *meshhdr, |
212 | const char *addr4or5, const char *addr6); |
213 | int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, |
214 | const u8 *addr, struct ieee80211s_hdr *mesh_hdr); |
215 | bool mesh_matches_local(struct ieee80211_sub_if_data *sdata, |
216 | struct ieee802_11_elems *ie); |
217 | void mesh_ids_set_default(struct ieee80211_if_mesh *mesh); |
218 | int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata, |
219 | struct sk_buff *skb); |
220 | int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, |
221 | struct sk_buff *skb); |
222 | int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, |
223 | struct sk_buff *skb); |
224 | int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata, |
225 | struct sk_buff *skb); |
226 | int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata, |
227 | struct sk_buff *skb); |
228 | int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata, |
229 | struct sk_buff *skb); |
230 | void mesh_rmc_free(struct ieee80211_sub_if_data *sdata); |
231 | int mesh_rmc_init(struct ieee80211_sub_if_data *sdata); |
232 | void ieee80211s_init(void); |
233 | void ieee80211s_update_metric(struct ieee80211_local *local, |
234 | struct sta_info *sta, struct sk_buff *skb); |
235 | void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata); |
236 | int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata); |
237 | void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata); |
238 | void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh); |
239 | const struct ieee80211_mesh_sync_ops *ieee80211_mesh_sync_ops_get(u8 method); |
240 | /* wrapper for ieee80211_bss_info_change_notify() */ |
241 | void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata, |
242 | u32 changed); |
243 | |
244 | /* mesh power save */ |
245 | u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata); |
246 | u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta, |
247 | enum nl80211_mesh_power_mode pm); |
248 | void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata, |
249 | struct sta_info *sta, |
250 | struct ieee80211_hdr *hdr); |
251 | void ieee80211_mps_sta_status_update(struct sta_info *sta); |
252 | void ieee80211_mps_rx_h_sta_process(struct sta_info *sta, |
253 | struct ieee80211_hdr *hdr); |
254 | void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta, |
255 | bool tx, bool acked); |
256 | void ieee80211_mps_frame_release(struct sta_info *sta, |
257 | struct ieee802_11_elems *elems); |
258 | |
259 | /* Mesh paths */ |
260 | int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata, |
261 | struct sk_buff *skb); |
262 | int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, |
263 | struct sk_buff *skb); |
264 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata); |
265 | struct mesh_path *mesh_path_lookup(struct ieee80211_sub_if_data *sdata, |
266 | const u8 *dst); |
267 | struct mesh_path *mpp_path_lookup(struct ieee80211_sub_if_data *sdata, |
268 | const u8 *dst); |
269 | int mpp_path_add(struct ieee80211_sub_if_data *sdata, |
270 | const u8 *dst, const u8 *mpp); |
271 | struct mesh_path * |
272 | mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx); |
273 | void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop); |
274 | void mesh_path_expire(struct ieee80211_sub_if_data *sdata); |
275 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
276 | struct ieee80211_mgmt *mgmt, size_t len); |
277 | struct mesh_path * |
278 | mesh_path_add(struct ieee80211_sub_if_data *sdata, const u8 *dst); |
279 | |
280 | int mesh_path_add_gate(struct mesh_path *mpath); |
281 | int mesh_path_send_to_gates(struct mesh_path *mpath); |
282 | int mesh_gate_num(struct ieee80211_sub_if_data *sdata); |
283 | |
284 | /* Mesh plinks */ |
285 | void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata, |
286 | u8 *hw_addr, struct ieee802_11_elems *ie); |
287 | bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie); |
288 | u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata); |
289 | void mesh_plink_broken(struct sta_info *sta); |
290 | u32 mesh_plink_deactivate(struct sta_info *sta); |
291 | u32 mesh_plink_open(struct sta_info *sta); |
292 | u32 mesh_plink_block(struct sta_info *sta); |
293 | void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, |
294 | struct ieee80211_mgmt *mgmt, size_t len, |
295 | struct ieee80211_rx_status *rx_status); |
296 | void mesh_sta_cleanup(struct sta_info *sta); |
297 | |
298 | /* Private interfaces */ |
299 | /* Mesh tables */ |
300 | void mesh_mpath_table_grow(void); |
301 | void mesh_mpp_table_grow(void); |
302 | /* Mesh paths */ |
303 | int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata, |
304 | u8 ttl, const u8 *target, u32 target_sn, |
305 | u16 target_rcode, const u8 *ra); |
306 | void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta); |
307 | void mesh_path_flush_pending(struct mesh_path *mpath); |
308 | void mesh_path_tx_pending(struct mesh_path *mpath); |
309 | int mesh_pathtbl_init(void); |
310 | void mesh_pathtbl_unregister(void); |
311 | int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr); |
312 | void mesh_path_timer(unsigned long data); |
313 | void mesh_path_flush_by_nexthop(struct sta_info *sta); |
314 | void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata, |
315 | struct sk_buff *skb); |
316 | void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata); |
317 | |
318 | bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt); |
319 | extern int mesh_paths_generation; |
320 | |
321 | #ifdef CONFIG_MAC80211_MESH |
322 | static inline |
323 | u32 mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata) |
324 | { |
325 | atomic_inc(&sdata->u.mesh.estab_plinks); |
326 | return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON; |
327 | } |
328 | |
329 | static inline |
330 | u32 mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata) |
331 | { |
332 | atomic_dec(&sdata->u.mesh.estab_plinks); |
333 | return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON; |
334 | } |
335 | |
336 | static inline int mesh_plink_free_count(struct ieee80211_sub_if_data *sdata) |
337 | { |
338 | return sdata->u.mesh.mshcfg.dot11MeshMaxPeerLinks - |
339 | atomic_read(&sdata->u.mesh.estab_plinks); |
340 | } |
341 | |
342 | static inline bool mesh_plink_availables(struct ieee80211_sub_if_data *sdata) |
343 | { |
344 | return (min_t(long, mesh_plink_free_count(sdata), |
345 | MESH_MAX_PLINKS - sdata->local->num_sta)) > 0; |
346 | } |
347 | |
348 | static inline void mesh_path_activate(struct mesh_path *mpath) |
349 | { |
350 | mpath->flags |= MESH_PATH_ACTIVE | MESH_PATH_RESOLVED; |
351 | } |
352 | |
353 | static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata) |
354 | { |
355 | return sdata->u.mesh.mesh_pp_id == IEEE80211_PATH_PROTOCOL_HWMP; |
356 | } |
357 | |
358 | void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local); |
359 | |
360 | void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata); |
361 | void mesh_sync_adjust_tbtt(struct ieee80211_sub_if_data *sdata); |
362 | void ieee80211s_stop(void); |
363 | #else |
364 | static inline void |
365 | ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local) {} |
366 | static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata) |
367 | { return false; } |
368 | static inline void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata) |
369 | {} |
370 | static inline void ieee80211s_stop(void) {} |
371 | #endif |
372 | |
373 | #endif /* IEEE80211S_H */ |
374 |
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