~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/mac80211/mesh.h

Version: ~ [ linux-5.8-rc4 ] ~ [ linux-5.7.7 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.50 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.131 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.187 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.229 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.229 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp