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ccf80ddf | 1 | /* |
264d9b7d | 2 | * Copyright (c) 2008, 2009 open80211s Ltd. |
ccf80ddf LCC |
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 | ||
902acc78 | 14 | #include <linux/types.h> |
ccf80ddf | 15 | #include <linux/jhash.h> |
902acc78 | 16 | #include "ieee80211_i.h" |
ccf80ddf | 17 | |
ccf80ddf LCC |
18 | |
19 | /* Data structures */ | |
20 | ||
21 | /** | |
22 | * enum mesh_path_flags - mac80211 mesh path flags | |
23 | * | |
eb80ed8d RR |
24 | * @MESH_PATH_ACTIVE: the mesh path can be used for forwarding |
25 | * @MESH_PATH_RESOLVING: the discovery process is running for this mesh path | |
d19b3bf6 | 26 | * @MESH_PATH_SN_VALID: the mesh path contains a valid destination sequence |
bf7cd94d | 27 | * number |
ccf80ddf | 28 | * @MESH_PATH_FIXED: the mesh path has been manually set and should not be |
bf7cd94d | 29 | * modified |
ccf80ddf | 30 | * @MESH_PATH_RESOLVED: the mesh path can has been resolved |
f3011cf9 | 31 | * @MESH_PATH_REQ_QUEUED: there is an unsent path request for this destination |
bf7cd94d | 32 | * already queued up, waiting for the discovery process to start. |
74932959 BC |
33 | * @MESH_PATH_DELETED: the mesh path has been deleted and should no longer |
34 | * be used | |
ccf80ddf | 35 | * |
eb80ed8d | 36 | * MESH_PATH_RESOLVED is used by the mesh path timer to |
ccf80ddf LCC |
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), | |
d19b3bf6 | 42 | MESH_PATH_SN_VALID = BIT(2), |
ccf80ddf LCC |
43 | MESH_PATH_FIXED = BIT(3), |
44 | MESH_PATH_RESOLVED = BIT(4), | |
f3011cf9 | 45 | MESH_PATH_REQ_QUEUED = BIT(5), |
74932959 | 46 | MESH_PATH_DELETED = BIT(6), |
ccf80ddf LCC |
47 | }; |
48 | ||
18889231 JC |
49 | /** |
50 | * enum mesh_deferred_task_flags - mac80211 mesh deferred tasks | |
51 | * | |
52 | * | |
53 | * | |
54 | * @MESH_WORK_HOUSEKEEPING: run the periodic mesh housekeeping tasks | |
e304bfd3 | 55 | * @MESH_WORK_ROOT: the mesh root station needs to send a frame |
dbf498fb JC |
56 | * @MESH_WORK_DRIFT_ADJUST: time to compensate for clock drift relative to other |
57 | * mesh nodes | |
f81a9ded | 58 | * @MESH_WORK_MBSS_CHANGED: rebuild beacon and notify driver of BSS changes |
18889231 JC |
59 | */ |
60 | enum mesh_deferred_task_flags { | |
61 | MESH_WORK_HOUSEKEEPING, | |
e304bfd3 | 62 | MESH_WORK_ROOT, |
dbf498fb | 63 | MESH_WORK_DRIFT_ADJUST, |
f81a9ded | 64 | MESH_WORK_MBSS_CHANGED, |
18889231 JC |
65 | }; |
66 | ||
ccf80ddf LCC |
67 | /** |
68 | * struct mesh_path - mac80211 mesh path structure | |
69 | * | |
70 | * @dst: mesh path destination mac address | |
68bb54b4 BC |
71 | * @mpp: mesh proxy mac address |
72 | * @rhash: rhashtable list pointer | |
73 | * @gate_list: list pointer for known gates list | |
f698d856 | 74 | * @sdata: mesh subif |
ccf80ddf | 75 | * @next_hop: mesh neighbor to which frames for this destination will be |
bf7cd94d | 76 | * forwarded |
ccf80ddf LCC |
77 | * @timer: mesh path discovery timer |
78 | * @frame_queue: pending queue for frames sent to this destination while the | |
bf7cd94d | 79 | * path is unresolved |
68bb54b4 | 80 | * @rcu: rcu head for freeing mesh path |
d19b3bf6 | 81 | * @sn: target sequence number |
ccf80ddf LCC |
82 | * @metric: current metric to this destination |
83 | * @hop_count: hops to destination | |
84 | * @exp_time: in jiffies, when the path will expire or when it expired | |
85 | * @discovery_timeout: timeout (lapse in jiffies) used for the last discovery | |
bf7cd94d | 86 | * retry |
ccf80ddf LCC |
87 | * @discovery_retries: number of discovery retries |
88 | * @flags: mesh path flags, as specified on &enum mesh_path_flags | |
f5e50cd0 JC |
89 | * @state_lock: mesh path state lock used to protect changes to the |
90 | * mpath itself. No need to take this lock when adding or removing | |
91 | * an mpath to a hash bucket on a path table. | |
3d045a54 | 92 | * @rann_snd_addr: the RANN sender address |
d2a079fd | 93 | * @rann_metric: the aggregated path metric towards the root node |
728b19e5 | 94 | * @last_preq_to_root: Timestamp of last PREQ sent to root |
3d045a54 | 95 | * @is_root: the destination station of this path is a root node |
5ee68e5b | 96 | * @is_gate: the destination station of this path is a mesh gate |
ccf80ddf LCC |
97 | * |
98 | * | |
68bb54b4 BC |
99 | * The dst address is unique in the mesh path table. Since the mesh_path is |
100 | * protected by RCU, deleting the next_hop STA must remove / substitute the | |
101 | * mesh_path structure and wait until that is no longer reachable before | |
102 | * destroying the STA completely. | |
ccf80ddf LCC |
103 | */ |
104 | struct mesh_path { | |
105 | u8 dst[ETH_ALEN]; | |
79617dee | 106 | u8 mpp[ETH_ALEN]; /* used for MPP or MAP */ |
60854fd9 | 107 | struct rhash_head rhash; |
947c2a0e | 108 | struct hlist_node gate_list; |
f698d856 | 109 | struct ieee80211_sub_if_data *sdata; |
40b275b6 | 110 | struct sta_info __rcu *next_hop; |
ccf80ddf LCC |
111 | struct timer_list timer; |
112 | struct sk_buff_head frame_queue; | |
113 | struct rcu_head rcu; | |
d19b3bf6 | 114 | u32 sn; |
ccf80ddf LCC |
115 | u32 metric; |
116 | u8 hop_count; | |
117 | unsigned long exp_time; | |
118 | u32 discovery_timeout; | |
119 | u8 discovery_retries; | |
120 | enum mesh_path_flags flags; | |
121 | spinlock_t state_lock; | |
3d045a54 | 122 | u8 rann_snd_addr[ETH_ALEN]; |
d2a079fd | 123 | u32 rann_metric; |
728b19e5 | 124 | unsigned long last_preq_to_root; |
3d045a54 | 125 | bool is_root; |
5ee68e5b | 126 | bool is_gate; |
ccf80ddf LCC |
127 | }; |
128 | ||
129 | /** | |
130 | * struct mesh_table | |
131 | * | |
5ee68e5b JC |
132 | * @known_gates: list of known mesh gates and their mpaths by the station. The |
133 | * gate's mpath may or may not be resolved and active. | |
68bb54b4 BC |
134 | * @gates_lock: protects updates to known_gates |
135 | * @rhead: the rhashtable containing struct mesh_paths, keyed by dest addr | |
136 | * @entries: number of entries in the table | |
ccf80ddf LCC |
137 | */ |
138 | struct mesh_table { | |
18b27ff7 | 139 | struct hlist_head known_gates; |
5ee68e5b | 140 | spinlock_t gates_lock; |
60854fd9 | 141 | struct rhashtable rhead; |
3257523b | 142 | atomic_t entries; /* Up to MAX_MESH_NEIGHBOURS */ |
ccf80ddf LCC |
143 | }; |
144 | ||
145 | /* Recent multicast cache */ | |
146 | /* RMC_BUCKETS must be a power of 2, maximum 256 */ | |
147 | #define RMC_BUCKETS 256 | |
148 | #define RMC_QUEUE_MAX_LEN 4 | |
149 | #define RMC_TIMEOUT (3 * HZ) | |
150 | ||
151 | /** | |
152 | * struct rmc_entry - entry in the Recent Multicast Cache | |
153 | * | |
154 | * @seqnum: mesh sequence number of the frame | |
155 | * @exp_time: expiration time of the entry, in jiffies | |
156 | * @sa: source address of the frame | |
68bb54b4 | 157 | * @list: hashtable list pointer |
ccf80ddf LCC |
158 | * |
159 | * The Recent Multicast Cache keeps track of the latest multicast frames that | |
160 | * have been received by a mesh interface and discards received multicast frames | |
161 | * that are found in the cache. | |
162 | */ | |
163 | struct rmc_entry { | |
47a0489c | 164 | struct hlist_node list; |
ccf80ddf | 165 | unsigned long exp_time; |
3257523b | 166 | u32 seqnum; |
ccf80ddf LCC |
167 | u8 sa[ETH_ALEN]; |
168 | }; | |
169 | ||
170 | struct mesh_rmc { | |
47a0489c | 171 | struct hlist_head bucket[RMC_BUCKETS]; |
51ceddad | 172 | u32 idx_mask; |
ccf80ddf LCC |
173 | }; |
174 | ||
25d49e4d | 175 | #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ) |
ccf80ddf | 176 | |
ccf80ddf LCC |
177 | #define MESH_PATH_EXPIRE (600 * HZ) |
178 | ||
ccf80ddf LCC |
179 | /* Default maximum number of plinks per interface */ |
180 | #define MESH_MAX_PLINKS 256 | |
181 | ||
182 | /* Maximum number of paths per interface */ | |
183 | #define MESH_MAX_MPATHS 1024 | |
184 | ||
4bd4c2dd TP |
185 | /* Number of frames buffered per destination for unresolved destinations */ |
186 | #define MESH_FRAME_QUEUE_LEN 10 | |
187 | ||
ccf80ddf LCC |
188 | /* Public interfaces */ |
189 | /* Various */ | |
3c5772a5 | 190 | int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, |
15ff6365 | 191 | const u8 *da, const u8 *sa); |
5edfcee5 AH |
192 | unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata, |
193 | struct ieee80211s_hdr *meshhdr, | |
194 | const char *addr4or5, const char *addr6); | |
bf7cd94d JB |
195 | int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, |
196 | const u8 *addr, struct ieee80211s_hdr *mesh_hdr); | |
f743ff49 TP |
197 | bool mesh_matches_local(struct ieee80211_sub_if_data *sdata, |
198 | struct ieee802_11_elems *ie); | |
472dbc45 | 199 | void mesh_ids_set_default(struct ieee80211_if_mesh *mesh); |
bf7cd94d JB |
200 | int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata, |
201 | struct sk_buff *skb); | |
202 | int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, | |
203 | struct sk_buff *skb); | |
204 | int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, | |
205 | struct sk_buff *skb); | |
206 | int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata, | |
207 | struct sk_buff *skb); | |
208 | int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata, | |
209 | struct sk_buff *skb); | |
210 | int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata, | |
211 | struct sk_buff *skb); | |
c85fb53c BC |
212 | int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata, |
213 | struct sk_buff *skb); | |
214 | int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata, | |
215 | struct sk_buff *skb); | |
f698d856 JBG |
216 | void mesh_rmc_free(struct ieee80211_sub_if_data *sdata); |
217 | int mesh_rmc_init(struct ieee80211_sub_if_data *sdata); | |
ccf80ddf | 218 | void ieee80211s_init(void); |
bfc32e6a | 219 | void ieee80211s_update_metric(struct ieee80211_local *local, |
bf7cd94d | 220 | struct sta_info *sta, struct sk_buff *skb); |
902acc78 | 221 | void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata); |
0371a08f | 222 | void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata); |
2b5e1967 | 223 | int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata); |
472dbc45 | 224 | void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata); |
63c5723b | 225 | void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh); |
8ba7acf3 | 226 | const struct ieee80211_mesh_sync_ops *ieee80211_mesh_sync_ops_get(u8 method); |
2b5e1967 TP |
227 | /* wrapper for ieee80211_bss_info_change_notify() */ |
228 | void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata, | |
229 | u32 changed); | |
902acc78 | 230 | |
3f52b7e3 | 231 | /* mesh power save */ |
39886b61 TP |
232 | u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata); |
233 | u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta, | |
234 | enum nl80211_mesh_power_mode pm); | |
3f52b7e3 MP |
235 | void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata, |
236 | struct sta_info *sta, | |
237 | struct ieee80211_hdr *hdr); | |
238 | void ieee80211_mps_sta_status_update(struct sta_info *sta); | |
239 | void ieee80211_mps_rx_h_sta_process(struct sta_info *sta, | |
240 | struct ieee80211_hdr *hdr); | |
241 | void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta, | |
242 | bool tx, bool acked); | |
243 | void ieee80211_mps_frame_release(struct sta_info *sta, | |
244 | struct ieee802_11_elems *elems); | |
245 | ||
ccf80ddf | 246 | /* Mesh paths */ |
bf7cd94d JB |
247 | int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata, |
248 | struct sk_buff *skb); | |
249 | int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, | |
250 | struct sk_buff *skb); | |
f698d856 | 251 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata); |
bf7cd94d JB |
252 | struct mesh_path *mesh_path_lookup(struct ieee80211_sub_if_data *sdata, |
253 | const u8 *dst); | |
254 | struct mesh_path *mpp_path_lookup(struct ieee80211_sub_if_data *sdata, | |
255 | const u8 *dst); | |
256 | int mpp_path_add(struct ieee80211_sub_if_data *sdata, | |
257 | const u8 *dst, const u8 *mpp); | |
258 | struct mesh_path * | |
259 | mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx); | |
a2db2ed3 HR |
260 | struct mesh_path * |
261 | mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx); | |
ccf80ddf | 262 | void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop); |
f698d856 | 263 | void mesh_path_expire(struct ieee80211_sub_if_data *sdata); |
f698d856 | 264 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
bf7cd94d | 265 | struct ieee80211_mgmt *mgmt, size_t len); |
ae76eef0 BC |
266 | struct mesh_path * |
267 | mesh_path_add(struct ieee80211_sub_if_data *sdata, const u8 *dst); | |
5ee68e5b JC |
268 | |
269 | int mesh_path_add_gate(struct mesh_path *mpath); | |
270 | int mesh_path_send_to_gates(struct mesh_path *mpath); | |
271 | int mesh_gate_num(struct ieee80211_sub_if_data *sdata); | |
bf7cd94d | 272 | |
ccf80ddf | 273 | /* Mesh plinks */ |
f743ff49 | 274 | void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata, |
bf7cd94d | 275 | u8 *hw_addr, struct ieee802_11_elems *ie); |
f698d856 | 276 | bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie); |
df323818 | 277 | u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata); |
ccf80ddf | 278 | void mesh_plink_broken(struct sta_info *sta); |
45b5028e | 279 | u32 mesh_plink_deactivate(struct sta_info *sta); |
39886b61 TP |
280 | u32 mesh_plink_open(struct sta_info *sta); |
281 | u32 mesh_plink_block(struct sta_info *sta); | |
f698d856 JBG |
282 | void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, |
283 | struct ieee80211_mgmt *mgmt, size_t len, | |
284 | struct ieee80211_rx_status *rx_status); | |
45b5028e | 285 | void mesh_sta_cleanup(struct sta_info *sta); |
ccf80ddf LCC |
286 | |
287 | /* Private interfaces */ | |
ccf80ddf | 288 | /* Mesh paths */ |
bf7cd94d | 289 | int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata, |
f63f8421 CYY |
290 | u8 ttl, const u8 *target, u32 target_sn, |
291 | u16 target_rcode, const u8 *ra); | |
ccf80ddf LCC |
292 | void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta); |
293 | void mesh_path_flush_pending(struct mesh_path *mpath); | |
294 | void mesh_path_tx_pending(struct mesh_path *mpath); | |
2bdaf386 BC |
295 | int mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata); |
296 | void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata); | |
bf7cd94d | 297 | int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr); |
ccf80ddf LCC |
298 | void mesh_path_timer(unsigned long data); |
299 | void mesh_path_flush_by_nexthop(struct sta_info *sta); | |
bf7cd94d JB |
300 | void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata, |
301 | struct sk_buff *skb); | |
e304bfd3 | 302 | void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata); |
ccf80ddf | 303 | |
25d49e4d | 304 | bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt); |
f5ea9120 | 305 | |
902acc78 | 306 | #ifdef CONFIG_MAC80211_MESH |
1617bab8 MP |
307 | static inline |
308 | u32 mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata) | |
309 | { | |
310 | atomic_inc(&sdata->u.mesh.estab_plinks); | |
e05ecccd | 311 | return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON; |
1617bab8 MP |
312 | } |
313 | ||
314 | static inline | |
315 | u32 mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata) | |
316 | { | |
317 | atomic_dec(&sdata->u.mesh.estab_plinks); | |
e05ecccd | 318 | return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON; |
1617bab8 MP |
319 | } |
320 | ||
ccf80ddf LCC |
321 | static inline int mesh_plink_free_count(struct ieee80211_sub_if_data *sdata) |
322 | { | |
472dbc45 | 323 | return sdata->u.mesh.mshcfg.dot11MeshMaxPeerLinks - |
1258d976 | 324 | atomic_read(&sdata->u.mesh.estab_plinks); |
ccf80ddf LCC |
325 | } |
326 | ||
327 | static inline bool mesh_plink_availables(struct ieee80211_sub_if_data *sdata) | |
328 | { | |
d0709a65 | 329 | return (min_t(long, mesh_plink_free_count(sdata), |
ccf80ddf LCC |
330 | MESH_MAX_PLINKS - sdata->local->num_sta)) > 0; |
331 | } | |
332 | ||
333 | static inline void mesh_path_activate(struct mesh_path *mpath) | |
334 | { | |
335 | mpath->flags |= MESH_PATH_ACTIVE | MESH_PATH_RESOLVED; | |
336 | } | |
337 | ||
c7108a71 JC |
338 | static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata) |
339 | { | |
340 | return sdata->u.mesh.mesh_pp_id == IEEE80211_PATH_PROTOCOL_HWMP; | |
341 | } | |
342 | ||
94c514fe | 343 | void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata); |
dbf498fb | 344 | void mesh_sync_adjust_tbtt(struct ieee80211_sub_if_data *sdata); |
bf7cd94d | 345 | void ieee80211s_stop(void); |
902acc78 | 346 | #else |
c7108a71 JC |
347 | static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata) |
348 | { return false; } | |
94c514fe AE |
349 | static inline void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata) |
350 | {} | |
bf7cd94d | 351 | static inline void ieee80211s_stop(void) {} |
902acc78 JB |
352 | #endif |
353 | ||
ccf80ddf | 354 | #endif /* IEEE80211S_H */ |