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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 <asm/unaligned.h> |
17 | #include "ieee80211_i.h" |
18 | |
19 | |
20 | /* Data structures */ |
21 | |
22 | /** |
23 | * enum mesh_path_flags - mac80211 mesh path flags |
24 | * |
25 | * |
26 | * |
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 |
34 | * |
35 | * MESH_PATH_RESOLVED is used by the mesh path timer to |
36 | * decide when to stop or cancel the mesh path discovery. |
37 | */ |
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), |
44 | }; |
45 | |
46 | /** |
47 | * enum mesh_deferred_task_flags - mac80211 mesh deferred tasks |
48 | * |
49 | * |
50 | * |
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 |
57 | */ |
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, |
63 | }; |
64 | |
65 | /** |
66 | * struct mesh_path - mac80211 mesh path structure |
67 | * |
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 |
84 | * |
85 | * |
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. |
90 | */ |
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 *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; |
107 | }; |
108 | |
109 | /** |
110 | * struct mesh_table |
111 | * |
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: fuction 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 | */ |
124 | struct mesh_table { |
125 | /* Number of buckets will be 2^N */ |
126 | struct hlist_head *hash_buckets; |
127 | spinlock_t *hashwlock; /* One per bucket, for add/del */ |
128 | unsigned int hash_mask; /* (2^size_order) - 1 */ |
129 | __u32 hash_rnd; /* Used for hash generation */ |
130 | atomic_t entries; /* Up to MAX_MESH_NEIGHBOURS */ |
131 | void (*free_node) (struct hlist_node *p, bool free_leafs); |
132 | int (*copy_node) (struct hlist_node *p, struct mesh_table *newtbl); |
133 | int size_order; |
134 | int mean_chain_len; |
135 | }; |
136 | |
137 | /* Recent multicast cache */ |
138 | /* RMC_BUCKETS must be a power of 2, maximum 256 */ |
139 | #define RMC_BUCKETS 256 |
140 | #define RMC_QUEUE_MAX_LEN 4 |
141 | #define RMC_TIMEOUT (3 * HZ) |
142 | |
143 | /** |
144 | * struct rmc_entry - entry in the Recent Multicast Cache |
145 | * |
146 | * @seqnum: mesh sequence number of the frame |
147 | * @exp_time: expiration time of the entry, in jiffies |
148 | * @sa: source address of the frame |
149 | * |
150 | * The Recent Multicast Cache keeps track of the latest multicast frames that |
151 | * have been received by a mesh interface and discards received multicast frames |
152 | * that are found in the cache. |
153 | */ |
154 | struct rmc_entry { |
155 | struct list_head list; |
156 | u32 seqnum; |
157 | unsigned long exp_time; |
158 | u8 sa[ETH_ALEN]; |
159 | }; |
160 | |
161 | struct mesh_rmc { |
162 | struct rmc_entry bucket[RMC_BUCKETS]; |
163 | u32 idx_mask; |
164 | }; |
165 | |
166 | |
167 | /* |
168 | * MESH_CFG_COMP_LEN Includes: |
169 | * - Active path selection protocol ID. |
170 | * - Active path selection metric ID. |
171 | * - Congestion control mode identifier. |
172 | * - Channel precedence. |
173 | * Does not include mesh capabilities, which may vary across nodes in the same |
174 | * mesh |
175 | */ |
176 | #define MESH_CFG_CMP_LEN (IEEE80211_MESH_CONFIG_LEN - 2) |
177 | |
178 | /* Default values, timeouts in ms */ |
179 | #define MESH_TTL 31 |
180 | #define MESH_MAX_RETR 3 |
181 | #define MESH_RET_T 100 |
182 | #define MESH_CONF_T 100 |
183 | #define MESH_HOLD_T 100 |
184 | |
185 | #define MESH_PATH_TIMEOUT 5000 |
186 | /* Minimum interval between two consecutive PREQs originated by the same |
187 | * interface |
188 | */ |
189 | #define MESH_PREQ_MIN_INT 10 |
190 | #define MESH_DIAM_TRAVERSAL_TIME 50 |
191 | /* A path will be refreshed if it is used PATH_REFRESH_TIME milliseconds before |
192 | * timing out. This way it will remain ACTIVE and no data frames will be |
193 | * unnecesarily held in the pending queue. |
194 | */ |
195 | #define MESH_PATH_REFRESH_TIME 1000 |
196 | #define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME) |
197 | #define MESH_DEFAULT_BEACON_INTERVAL 1000 /* in 1024 us units */ |
198 | |
199 | #define MESH_MAX_PREQ_RETRIES 4 |
200 | #define MESH_PATH_EXPIRE (600 * HZ) |
201 | |
202 | /* Default maximum number of established plinks per interface */ |
203 | #define MESH_MAX_ESTAB_PLINKS 32 |
204 | |
205 | /* Default maximum number of plinks per interface */ |
206 | #define MESH_MAX_PLINKS 256 |
207 | |
208 | /* Maximum number of paths per interface */ |
209 | #define MESH_MAX_MPATHS 1024 |
210 | |
211 | /* Pending ANA approval */ |
212 | #define MESH_PLINK_CATEGORY 30 |
213 | #define MESH_PATH_SEL_CATEGORY 32 |
214 | #define MESH_PATH_SEL_ACTION 0 |
215 | |
216 | /* PERR reason codes */ |
217 | #define PEER_RCODE_UNSPECIFIED 11 |
218 | #define PERR_RCODE_NO_ROUTE 12 |
219 | #define PERR_RCODE_DEST_UNREACH 13 |
220 | |
221 | /* Public interfaces */ |
222 | /* Various */ |
223 | int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, |
224 | const u8 *da, const u8 *sa); |
225 | int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr, |
226 | struct ieee80211_sub_if_data *sdata, char *addr4, |
227 | char *addr5, char *addr6); |
228 | int mesh_rmc_check(u8 *addr, struct ieee80211s_hdr *mesh_hdr, |
229 | struct ieee80211_sub_if_data *sdata); |
230 | bool mesh_matches_local(struct ieee802_11_elems *ie, |
231 | struct ieee80211_sub_if_data *sdata); |
232 | void mesh_ids_set_default(struct ieee80211_if_mesh *mesh); |
233 | void mesh_mgmt_ies_add(struct sk_buff *skb, |
234 | struct ieee80211_sub_if_data *sdata); |
235 | void mesh_rmc_free(struct ieee80211_sub_if_data *sdata); |
236 | int mesh_rmc_init(struct ieee80211_sub_if_data *sdata); |
237 | void ieee80211s_init(void); |
238 | void ieee80211s_update_metric(struct ieee80211_local *local, |
239 | struct sta_info *stainfo, struct sk_buff *skb); |
240 | void ieee80211s_stop(void); |
241 | void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata); |
242 | ieee80211_rx_result |
243 | ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb); |
244 | void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata); |
245 | void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata); |
246 | void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh); |
247 | |
248 | /* Mesh paths */ |
249 | int mesh_nexthop_lookup(struct sk_buff *skb, |
250 | struct ieee80211_sub_if_data *sdata); |
251 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata); |
252 | struct mesh_path *mesh_path_lookup(u8 *dst, |
253 | struct ieee80211_sub_if_data *sdata); |
254 | struct mesh_path *mpp_path_lookup(u8 *dst, |
255 | struct ieee80211_sub_if_data *sdata); |
256 | int mpp_path_add(u8 *dst, u8 *mpp, struct ieee80211_sub_if_data *sdata); |
257 | struct mesh_path *mesh_path_lookup_by_idx(int idx, |
258 | struct ieee80211_sub_if_data *sdata); |
259 | void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop); |
260 | void mesh_path_expire(struct ieee80211_sub_if_data *sdata); |
261 | void mesh_path_flush(struct ieee80211_sub_if_data *sdata); |
262 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
263 | struct ieee80211_mgmt *mgmt, size_t len); |
264 | int mesh_path_add(u8 *dst, struct ieee80211_sub_if_data *sdata); |
265 | /* Mesh plinks */ |
266 | void mesh_neighbour_update(u8 *hw_addr, u32 rates, |
267 | struct ieee80211_sub_if_data *sdata, bool add); |
268 | bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie); |
269 | void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata); |
270 | void mesh_plink_broken(struct sta_info *sta); |
271 | void mesh_plink_deactivate(struct sta_info *sta); |
272 | int mesh_plink_open(struct sta_info *sta); |
273 | void mesh_plink_block(struct sta_info *sta); |
274 | void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, |
275 | struct ieee80211_mgmt *mgmt, size_t len, |
276 | struct ieee80211_rx_status *rx_status); |
277 | |
278 | /* Private interfaces */ |
279 | /* Mesh tables */ |
280 | struct mesh_table *mesh_table_alloc(int size_order); |
281 | void mesh_table_free(struct mesh_table *tbl, bool free_leafs); |
282 | void mesh_mpath_table_grow(void); |
283 | void mesh_mpp_table_grow(void); |
284 | u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, |
285 | struct mesh_table *tbl); |
286 | /* Mesh paths */ |
287 | int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn, __le16 target_rcode, |
288 | const u8 *ra, struct ieee80211_sub_if_data *sdata); |
289 | void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta); |
290 | void mesh_path_flush_pending(struct mesh_path *mpath); |
291 | void mesh_path_tx_pending(struct mesh_path *mpath); |
292 | int mesh_pathtbl_init(void); |
293 | void mesh_pathtbl_unregister(void); |
294 | int mesh_path_del(u8 *addr, struct ieee80211_sub_if_data *sdata); |
295 | void mesh_path_timer(unsigned long data); |
296 | void mesh_path_flush_by_nexthop(struct sta_info *sta); |
297 | void mesh_path_discard_frame(struct sk_buff *skb, |
298 | struct ieee80211_sub_if_data *sdata); |
299 | void mesh_path_quiesce(struct ieee80211_sub_if_data *sdata); |
300 | void mesh_path_restart(struct ieee80211_sub_if_data *sdata); |
301 | void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata); |
302 | |
303 | extern int mesh_paths_generation; |
304 | |
305 | #ifdef CONFIG_MAC80211_MESH |
306 | extern int mesh_allocated; |
307 | |
308 | static inline int mesh_plink_free_count(struct ieee80211_sub_if_data *sdata) |
309 | { |
310 | return sdata->u.mesh.mshcfg.dot11MeshMaxPeerLinks - |
311 | atomic_read(&sdata->u.mesh.mshstats.estab_plinks); |
312 | } |
313 | |
314 | static inline bool mesh_plink_availables(struct ieee80211_sub_if_data *sdata) |
315 | { |
316 | return (min_t(long, mesh_plink_free_count(sdata), |
317 | MESH_MAX_PLINKS - sdata->local->num_sta)) > 0; |
318 | } |
319 | |
320 | static inline void mesh_path_activate(struct mesh_path *mpath) |
321 | { |
322 | mpath->flags |= MESH_PATH_ACTIVE | MESH_PATH_RESOLVED; |
323 | } |
324 | |
325 | #define for_each_mesh_entry(x, p, node, i) \ |
326 | for (i = 0; i <= x->hash_mask; i++) \ |
327 | hlist_for_each_entry_rcu(node, p, &x->hash_buckets[i], list) |
328 | |
329 | void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local); |
330 | |
331 | void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata); |
332 | void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata); |
333 | void mesh_plink_quiesce(struct sta_info *sta); |
334 | void mesh_plink_restart(struct sta_info *sta); |
335 | #else |
336 | #define mesh_allocated 0 |
337 | static inline void |
338 | ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local) {} |
339 | static inline void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata) |
340 | {} |
341 | static inline void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata) |
342 | {} |
343 | static inline void mesh_plink_quiesce(struct sta_info *sta) {} |
344 | static inline void mesh_plink_restart(struct sta_info *sta) {} |
345 | #endif |
346 | |
347 | #endif /* IEEE80211S_H */ |
348 |
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