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Luis Carlos Coboccf80dd2008-02-23 15:17:08 +01001/*
2 * Copyright (c) 2008 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
Johannes Berg902acc72008-02-23 15:17:19 +010014#include <linux/types.h>
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +010015#include <linux/jhash.h>
Al Virof375d552008-04-27 06:19:18 +010016#include <asm/unaligned.h>
Johannes Berg902acc72008-02-23 15:17:19 +010017#include "ieee80211_i.h"
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +010018
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +010019
20/* Data structures */
21
22/**
23 * enum mesh_path_flags - mac80211 mesh path flags
24 *
25 *
26 *
Rami Roseneb80ed82009-01-19 13:50:32 +020027 * @MESH_PATH_ACTIVE: the mesh path can be used for forwarding
28 * @MESH_PATH_RESOLVING: the discovery process is running for this mesh path
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +010029 * @MESH_PATH_DSN_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
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +010034 *
Rami Roseneb80ed82009-01-19 13:50:32 +020035 * MESH_PATH_RESOLVED is used by the mesh path timer to
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +010036 * decide when to stop or cancel the mesh path discovery.
37 */
38enum mesh_path_flags {
39 MESH_PATH_ACTIVE = BIT(0),
40 MESH_PATH_RESOLVING = BIT(1),
41 MESH_PATH_DSN_VALID = BIT(2),
42 MESH_PATH_FIXED = BIT(3),
43 MESH_PATH_RESOLVED = BIT(4),
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +010044};
45
46/**
47 * struct mesh_path - mac80211 mesh path structure
48 *
49 * @dst: mesh path destination mac address
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +120050 * @sdata: mesh subif
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +010051 * @next_hop: mesh neighbor to which frames for this destination will be
52 * forwarded
53 * @timer: mesh path discovery timer
54 * @frame_queue: pending queue for frames sent to this destination while the
55 * path is unresolved
56 * @dsn: destination sequence number of the destination
57 * @metric: current metric to this destination
58 * @hop_count: hops to destination
59 * @exp_time: in jiffies, when the path will expire or when it expired
60 * @discovery_timeout: timeout (lapse in jiffies) used for the last discovery
61 * retry
62 * @discovery_retries: number of discovery retries
63 * @flags: mesh path flags, as specified on &enum mesh_path_flags
Javier Cardonafe583432009-08-10 12:15:46 -070064 * @state_lock: mesh path state lock
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +010065 *
66 *
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +120067 * The combination of dst and sdata is unique in the mesh path table. Since the
Johannes Bergd0709a62008-02-25 16:27:46 +010068 * next_hop STA is only protected by RCU as well, deleting the STA must also
69 * remove/substitute the mesh_path structure and wait until that is no longer
70 * reachable before destroying the STA completely.
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +010071 */
72struct mesh_path {
73 u8 dst[ETH_ALEN];
YanBo79617de2008-09-22 13:30:32 +080074 u8 mpp[ETH_ALEN]; /* used for MPP or MAP */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +120075 struct ieee80211_sub_if_data *sdata;
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +010076 struct sta_info *next_hop;
77 struct timer_list timer;
78 struct sk_buff_head frame_queue;
79 struct rcu_head rcu;
80 u32 dsn;
81 u32 metric;
82 u8 hop_count;
83 unsigned long exp_time;
84 u32 discovery_timeout;
85 u8 discovery_retries;
86 enum mesh_path_flags flags;
87 spinlock_t state_lock;
88};
89
90/**
91 * struct mesh_table
92 *
93 * @hash_buckets: array of hash buckets of the table
94 * @hashwlock: array of locks to protect write operations, one per bucket
95 * @hash_mask: 2^size_order - 1, used to compute hash idx
96 * @hash_rnd: random value used for hash computations
97 * @entries: number of entries in the table
98 * @free_node: function to free nodes of the table
99 * @copy_node: fuction to copy nodes of the table
100 * @size_order: determines size of the table, there will be 2^size_order hash
101 * buckets
102 * @mean_chain_len: maximum average length for the hash buckets' list, if it is
103 * reached, the table will grow
104 */
105struct mesh_table {
106 /* Number of buckets will be 2^N */
107 struct hlist_head *hash_buckets;
108 spinlock_t *hashwlock; /* One per bucket, for add/del */
109 unsigned int hash_mask; /* (2^size_order) - 1 */
110 __u32 hash_rnd; /* Used for hash generation */
111 atomic_t entries; /* Up to MAX_MESH_NEIGHBOURS */
112 void (*free_node) (struct hlist_node *p, bool free_leafs);
Pavel Emelyanov4caf86c2008-05-07 19:47:01 +0400113 int (*copy_node) (struct hlist_node *p, struct mesh_table *newtbl);
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100114 int size_order;
115 int mean_chain_len;
116};
117
118/* Recent multicast cache */
119/* RMC_BUCKETS must be a power of 2, maximum 256 */
120#define RMC_BUCKETS 256
121#define RMC_QUEUE_MAX_LEN 4
122#define RMC_TIMEOUT (3 * HZ)
123
124/**
125 * struct rmc_entry - entry in the Recent Multicast Cache
126 *
127 * @seqnum: mesh sequence number of the frame
128 * @exp_time: expiration time of the entry, in jiffies
129 * @sa: source address of the frame
130 *
131 * The Recent Multicast Cache keeps track of the latest multicast frames that
132 * have been received by a mesh interface and discards received multicast frames
133 * that are found in the cache.
134 */
135struct rmc_entry {
136 struct list_head list;
137 u32 seqnum;
138 unsigned long exp_time;
139 u8 sa[ETH_ALEN];
140};
141
142struct mesh_rmc {
143 struct rmc_entry bucket[RMC_BUCKETS];
Luis Carlos Cobo51cedda2008-04-23 12:15:29 -0700144 u32 idx_mask;
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100145};
146
147
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100148/*
149 * MESH_CFG_COMP_LEN Includes:
150 * - Active path selection protocol ID.
151 * - Active path selection metric ID.
152 * - Congestion control mode identifier.
153 * - Channel precedence.
154 * Does not include mesh capabilities, which may vary across nodes in the same
155 * mesh
156 */
Johannes Berg1239cd52008-10-28 11:12:57 +0100157#define MESH_CFG_CMP_LEN (IEEE80211_MESH_CONFIG_LEN - 2)
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100158
159/* Default values, timeouts in ms */
160#define MESH_TTL 5
161#define MESH_MAX_RETR 3
162#define MESH_RET_T 100
163#define MESH_CONF_T 100
164#define MESH_HOLD_T 100
165
166#define MESH_PATH_TIMEOUT 5000
167/* Minimum interval between two consecutive PREQs originated by the same
168 * interface
169 */
170#define MESH_PREQ_MIN_INT 10
171#define MESH_DIAM_TRAVERSAL_TIME 50
172/* Paths will be refreshed if they are closer than PATH_REFRESH_TIME to their
173 * expiration
174 */
175#define MESH_PATH_REFRESH_TIME 1000
176#define MESH_MIN_DISCOVERY_TIMEOUT (2 * MESH_DIAM_TRAVERSAL_TIME)
177
178#define MESH_MAX_PREQ_RETRIES 4
179#define MESH_PATH_EXPIRE (600 * HZ)
180
181/* Default maximum number of established plinks per interface */
182#define MESH_MAX_ESTAB_PLINKS 32
183
184/* Default maximum number of plinks per interface */
185#define MESH_MAX_PLINKS 256
186
187/* Maximum number of paths per interface */
188#define MESH_MAX_MPATHS 1024
189
190/* Pending ANA approval */
191#define PLINK_CATEGORY 30
192#define MESH_PATH_SEL_CATEGORY 32
193
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100194/* Public interfaces */
195/* Various */
Javier Cardona3c5772a2009-08-10 12:15:48 -0700196int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
197 char *da, char *sa);
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100198int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
Javier Cardona3c5772a2009-08-10 12:15:48 -0700199 struct ieee80211_sub_if_data *sdata, char *addr4,
200 char *addr5, char *addr6);
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100201int mesh_rmc_check(u8 *addr, struct ieee80211s_hdr *mesh_hdr,
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200202 struct ieee80211_sub_if_data *sdata);
203bool mesh_matches_local(struct ieee802_11_elems *ie,
204 struct ieee80211_sub_if_data *sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200205void mesh_ids_set_default(struct ieee80211_if_mesh *mesh);
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200206void mesh_mgmt_ies_add(struct sk_buff *skb,
207 struct ieee80211_sub_if_data *sdata);
208void mesh_rmc_free(struct ieee80211_sub_if_data *sdata);
209int mesh_rmc_init(struct ieee80211_sub_if_data *sdata);
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100210void ieee80211s_init(void);
211void ieee80211s_stop(void);
Johannes Berg902acc72008-02-23 15:17:19 +0100212void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200213ieee80211_rx_result
Johannes Bergf1d58c22009-06-17 13:13:00 +0200214ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb);
Johannes Berg472dbc42008-09-11 00:01:49 +0200215void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata);
216void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata);
Johannes Berg902acc72008-02-23 15:17:19 +0100217
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100218/* Mesh paths */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200219int mesh_nexthop_lookup(struct sk_buff *skb,
220 struct ieee80211_sub_if_data *sdata);
221void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata);
222struct mesh_path *mesh_path_lookup(u8 *dst,
223 struct ieee80211_sub_if_data *sdata);
YanBo79617de2008-09-22 13:30:32 +0800224struct mesh_path *mpp_path_lookup(u8 *dst,
225 struct ieee80211_sub_if_data *sdata);
226int mpp_path_add(u8 *dst, u8 *mpp, struct ieee80211_sub_if_data *sdata);
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200227struct mesh_path *mesh_path_lookup_by_idx(int idx,
228 struct ieee80211_sub_if_data *sdata);
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100229void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop);
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200230void mesh_path_expire(struct ieee80211_sub_if_data *sdata);
231void mesh_path_flush(struct ieee80211_sub_if_data *sdata);
232void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
233 struct ieee80211_mgmt *mgmt, size_t len);
234int mesh_path_add(u8 *dst, struct ieee80211_sub_if_data *sdata);
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100235/* Mesh plinks */
Johannes Berg881d9482009-01-21 15:13:48 +0100236void mesh_neighbour_update(u8 *hw_addr, u32 rates,
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200237 struct ieee80211_sub_if_data *sdata, bool add);
238bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie);
Johannes Bergd0709a62008-02-25 16:27:46 +0100239void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata);
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100240void mesh_plink_broken(struct sta_info *sta);
241void mesh_plink_deactivate(struct sta_info *sta);
242int mesh_plink_open(struct sta_info *sta);
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100243void mesh_plink_block(struct sta_info *sta);
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200244void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
245 struct ieee80211_mgmt *mgmt, size_t len,
246 struct ieee80211_rx_status *rx_status);
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100247
248/* Private interfaces */
249/* Mesh tables */
250struct mesh_table *mesh_table_alloc(int size_order);
251void mesh_table_free(struct mesh_table *tbl, bool free_leafs);
252struct mesh_table *mesh_table_grow(struct mesh_table *tbl);
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200253u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata,
254 struct mesh_table *tbl);
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100255/* Mesh paths */
256int mesh_path_error_tx(u8 *dest, __le32 dest_dsn, u8 *ra,
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200257 struct ieee80211_sub_if_data *sdata);
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100258void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta);
259void mesh_path_flush_pending(struct mesh_path *mpath);
260void mesh_path_tx_pending(struct mesh_path *mpath);
261int mesh_pathtbl_init(void);
262void mesh_pathtbl_unregister(void);
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200263int mesh_path_del(u8 *addr, struct ieee80211_sub_if_data *sdata);
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100264void mesh_path_timer(unsigned long data);
265void mesh_path_flush_by_nexthop(struct sta_info *sta);
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200266void mesh_path_discard_frame(struct sk_buff *skb,
267 struct ieee80211_sub_if_data *sdata);
Johannes Berg5bb644a2009-05-17 11:40:42 +0200268void mesh_path_quiesce(struct ieee80211_sub_if_data *sdata);
269void mesh_path_restart(struct ieee80211_sub_if_data *sdata);
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100270
Johannes Bergf5ea9122009-08-07 16:17:38 +0200271extern int mesh_paths_generation;
272
Johannes Berg902acc72008-02-23 15:17:19 +0100273#ifdef CONFIG_MAC80211_MESH
274extern int mesh_allocated;
275
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100276static inline int mesh_plink_free_count(struct ieee80211_sub_if_data *sdata)
277{
Johannes Berg472dbc42008-09-11 00:01:49 +0200278 return sdata->u.mesh.mshcfg.dot11MeshMaxPeerLinks -
279 atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100280}
281
282static inline bool mesh_plink_availables(struct ieee80211_sub_if_data *sdata)
283{
Johannes Bergd0709a62008-02-25 16:27:46 +0100284 return (min_t(long, mesh_plink_free_count(sdata),
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100285 MESH_MAX_PLINKS - sdata->local->num_sta)) > 0;
286}
287
288static inline void mesh_path_activate(struct mesh_path *mpath)
289{
290 mpath->flags |= MESH_PATH_ACTIVE | MESH_PATH_RESOLVED;
291}
292
293#define for_each_mesh_entry(x, p, node, i) \
294 for (i = 0; i <= x->hash_mask; i++) \
295 hlist_for_each_entry_rcu(node, p, &x->hash_buckets[i], list)
296
Johannes Berg472dbc42008-09-11 00:01:49 +0200297void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local);
298
Johannes Berg5bb644a2009-05-17 11:40:42 +0200299void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata);
300void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata);
301void mesh_plink_quiesce(struct sta_info *sta);
302void mesh_plink_restart(struct sta_info *sta);
Johannes Berg902acc72008-02-23 15:17:19 +0100303#else
304#define mesh_allocated 0
Johannes Berg472dbc42008-09-11 00:01:49 +0200305static inline void
306ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local) {}
Johannes Berg5bb644a2009-05-17 11:40:42 +0200307static inline void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
308{}
309static inline void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
310{}
311static inline void mesh_plink_quiesce(struct sta_info *sta) {}
312static inline void mesh_plink_restart(struct sta_info *sta) {}
Johannes Berg902acc72008-02-23 15:17:19 +0100313#endif
314
Luis Carlos Coboccf80dd2008-02-23 15:17:08 +0100315#endif /* IEEE80211S_H */