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 */ 60 enum mesh_deferred_task_flags { 61 MESH_WORK_HOUSEKEEPING, 62 MESH_WORK_GROW_MPATH_TABLE, 63 MESH_WORK_GROW_MPP_TABLE, 64 MESH_WORK_ROOT, 65 }; 66 67 /** 68 * struct mesh_path - mac80211 mesh path structure 69 * 70 * @dst: mesh path destination mac address 71 * @sdata: mesh subif 72 * @next_hop: mesh neighbor to which frames for this destination will be 73 * forwarded 74 * @timer: mesh path discovery timer 75 * @frame_queue: pending queue for frames sent to this destination while the 76 * path is unresolved 77 * @sn: target sequence number 78 * @metric: current metric to this destination 79 * @hop_count: hops to destination 80 * @exp_time: in jiffies, when the path will expire or when it expired 81 * @discovery_timeout: timeout (lapse in jiffies) used for the last discovery 82 * retry 83 * @discovery_retries: number of discovery retries 84 * @flags: mesh path flags, as specified on &enum mesh_path_flags 85 * @state_lock: mesh path state lock used to protect changes to the 86 * mpath itself. No need to take this lock when adding or removing 87 * an mpath to a hash bucket on a path table. 88 * @rann_snd_addr: the RANN sender address 89 * @is_root: the destination station of this path is a root node 90 * @is_gate: the destination station of this path is a mesh gate 91 * 92 * 93 * The combination of dst and sdata is unique in the mesh path table. Since the 94 * next_hop STA is only protected by RCU as well, deleting the STA must also 95 * remove/substitute the mesh_path structure and wait until that is no longer 96 * reachable before destroying the STA completely. 97 */ 98 struct mesh_path { 99 u8 dst[ETH_ALEN]; 100 u8 mpp[ETH_ALEN]; /* used for MPP or MAP */ 101 struct ieee80211_sub_if_data *sdata; 102 struct sta_info __rcu *next_hop; 103 struct timer_list timer; 104 struct sk_buff_head frame_queue; 105 struct rcu_head rcu; 106 u32 sn; 107 u32 metric; 108 u8 hop_count; 109 unsigned long exp_time; 110 u32 discovery_timeout; 111 u8 discovery_retries; 112 enum mesh_path_flags flags; 113 spinlock_t state_lock; 114 u8 rann_snd_addr[ETH_ALEN]; 115 bool is_root; 116 bool is_gate; 117 }; 118 119 /** 120 * struct mesh_table 121 * 122 * @hash_buckets: array of hash buckets of the table 123 * @hashwlock: array of locks to protect write operations, one per bucket 124 * @hash_mask: 2^size_order - 1, used to compute hash idx 125 * @hash_rnd: random value used for hash computations 126 * @entries: number of entries in the table 127 * @free_node: function to free nodes of the table 128 * @copy_node: function to copy nodes of the table 129 * @size_order: determines size of the table, there will be 2^size_order hash 130 * buckets 131 * @mean_chain_len: maximum average length for the hash buckets' list, if it is 132 * reached, the table will grow 133 * @known_gates: list of known mesh gates and their mpaths by the station. The 134 * gate's mpath may or may not be resolved and active. 135 * 136 * rcu_head: RCU head to free the table 137 */ 138 struct mesh_table { 139 /* Number of buckets will be 2^N */ 140 struct hlist_head *hash_buckets; 141 spinlock_t *hashwlock; /* One per bucket, for add/del */ 142 unsigned int hash_mask; /* (2^size_order) - 1 */ 143 __u32 hash_rnd; /* Used for hash generation */ 144 atomic_t entries; /* Up to MAX_MESH_NEIGHBOURS */ 145 void (*free_node) (struct hlist_node *p, bool free_leafs); 146 int (*copy_node) (struct hlist_node *p, struct mesh_table *newtbl); 147 int size_order; 148 int mean_chain_len; 149 struct hlist_head *known_gates; 150 spinlock_t gates_lock; 151 152 struct rcu_head rcu_head; 153 }; 154 155 /* Recent multicast cache */ 156 /* RMC_BUCKETS must be a power of 2, maximum 256 */ 157 #define RMC_BUCKETS 256 158 #define RMC_QUEUE_MAX_LEN 4 159 #define RMC_TIMEOUT (3 * HZ) 160 161 /** 162 * struct rmc_entry - entry in the Recent Multicast Cache 163 * 164 * @seqnum: mesh sequence number of the frame 165 * @exp_time: expiration time of the entry, in jiffies 166 * @sa: source address of the frame 167 * 168 * The Recent Multicast Cache keeps track of the latest multicast frames that 169 * have been received by a mesh interface and discards received multicast frames 170 * that are found in the cache. 171 */ 172 struct rmc_entry { 173 struct list_head list; 174 u32 seqnum; 175 unsigned long exp_time; 176 u8 sa[ETH_ALEN]; 177 }; 178 179 struct mesh_rmc { 180 struct rmc_entry bucket[RMC_BUCKETS]; 181 u32 idx_mask; 182 }; 183 184 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ) 185 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ) 186 187 #define MESH_DEFAULT_BEACON_INTERVAL 1000 /* in 1024 us units */ 188 189 #define MESH_PATH_EXPIRE (600 * HZ) 190 191 /* Default maximum number of plinks per interface */ 192 #define MESH_MAX_PLINKS 256 193 194 /* Maximum number of paths per interface */ 195 #define MESH_MAX_MPATHS 1024 196 197 /* Public interfaces */ 198 /* Various */ 199 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, 200 const u8 *da, const u8 *sa); 201 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr, 202 struct ieee80211_sub_if_data *sdata, char *addr4or5, 203 char *addr6); 204 int mesh_rmc_check(u8 *addr, struct ieee80211s_hdr *mesh_hdr, 205 struct ieee80211_sub_if_data *sdata); 206 bool mesh_matches_local(struct ieee802_11_elems *ie, 207 struct ieee80211_sub_if_data *sdata); 208 void mesh_ids_set_default(struct ieee80211_if_mesh *mesh); 209 void mesh_mgmt_ies_add(struct sk_buff *skb, 210 struct ieee80211_sub_if_data *sdata); 211 int mesh_add_meshconf_ie(struct sk_buff *skb, 212 struct ieee80211_sub_if_data *sdata); 213 int mesh_add_meshid_ie(struct sk_buff *skb, 214 struct ieee80211_sub_if_data *sdata); 215 int mesh_add_rsn_ie(struct sk_buff *skb, 216 struct ieee80211_sub_if_data *sdata); 217 int mesh_add_vendor_ies(struct sk_buff *skb, 218 struct ieee80211_sub_if_data *sdata); 219 int mesh_add_ds_params_ie(struct sk_buff *skb, 220 struct ieee80211_sub_if_data *sdata); 221 int mesh_add_ht_cap_ie(struct sk_buff *skb, 222 struct ieee80211_sub_if_data *sdata); 223 int mesh_add_ht_info_ie(struct sk_buff *skb, 224 struct ieee80211_sub_if_data *sdata); 225 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata); 226 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata); 227 void ieee80211s_init(void); 228 void ieee80211s_update_metric(struct ieee80211_local *local, 229 struct sta_info *stainfo, struct sk_buff *skb); 230 void ieee80211s_stop(void); 231 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata); 232 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata); 233 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata); 234 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh); 235 236 /* Mesh paths */ 237 int mesh_nexthop_lookup(struct sk_buff *skb, 238 struct ieee80211_sub_if_data *sdata); 239 int mesh_nexthop_resolve(struct sk_buff *skb, 240 struct ieee80211_sub_if_data *sdata); 241 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata); 242 struct mesh_path *mesh_path_lookup(u8 *dst, 243 struct ieee80211_sub_if_data *sdata); 244 struct mesh_path *mpp_path_lookup(u8 *dst, 245 struct ieee80211_sub_if_data *sdata); 246 int mpp_path_add(u8 *dst, u8 *mpp, struct ieee80211_sub_if_data *sdata); 247 struct mesh_path *mesh_path_lookup_by_idx(int idx, 248 struct ieee80211_sub_if_data *sdata); 249 void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop); 250 void mesh_path_expire(struct ieee80211_sub_if_data *sdata); 251 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, 252 struct ieee80211_mgmt *mgmt, size_t len); 253 int mesh_path_add(u8 *dst, struct ieee80211_sub_if_data *sdata); 254 255 int mesh_path_add_gate(struct mesh_path *mpath); 256 int mesh_path_send_to_gates(struct mesh_path *mpath); 257 int mesh_gate_num(struct ieee80211_sub_if_data *sdata); 258 /* Mesh plinks */ 259 void mesh_neighbour_update(u8 *hw_addr, u32 rates, 260 struct ieee80211_sub_if_data *sdata, 261 struct ieee802_11_elems *ie); 262 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie); 263 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata); 264 void mesh_plink_broken(struct sta_info *sta); 265 void mesh_plink_deactivate(struct sta_info *sta); 266 int mesh_plink_open(struct sta_info *sta); 267 void mesh_plink_block(struct sta_info *sta); 268 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, 269 struct ieee80211_mgmt *mgmt, size_t len, 270 struct ieee80211_rx_status *rx_status); 271 272 /* Private interfaces */ 273 /* Mesh tables */ 274 void mesh_mpath_table_grow(void); 275 void mesh_mpp_table_grow(void); 276 /* Mesh paths */ 277 int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn, __le16 target_rcode, 278 const u8 *ra, struct ieee80211_sub_if_data *sdata); 279 void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta); 280 void mesh_path_flush_pending(struct mesh_path *mpath); 281 void mesh_path_tx_pending(struct mesh_path *mpath); 282 int mesh_pathtbl_init(void); 283 void mesh_pathtbl_unregister(void); 284 int mesh_path_del(u8 *addr, struct ieee80211_sub_if_data *sdata); 285 void mesh_path_timer(unsigned long data); 286 void mesh_path_flush_by_nexthop(struct sta_info *sta); 287 void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata); 288 void mesh_path_discard_frame(struct sk_buff *skb, 289 struct ieee80211_sub_if_data *sdata); 290 void mesh_path_quiesce(struct ieee80211_sub_if_data *sdata); 291 void mesh_path_restart(struct ieee80211_sub_if_data *sdata); 292 void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata); 293 294 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt); 295 extern int mesh_paths_generation; 296 297 #ifdef CONFIG_MAC80211_MESH 298 extern int mesh_allocated; 299 300 static inline int mesh_plink_free_count(struct ieee80211_sub_if_data *sdata) 301 { 302 return sdata->u.mesh.mshcfg.dot11MeshMaxPeerLinks - 303 atomic_read(&sdata->u.mesh.mshstats.estab_plinks); 304 } 305 306 static inline bool mesh_plink_availables(struct ieee80211_sub_if_data *sdata) 307 { 308 return (min_t(long, mesh_plink_free_count(sdata), 309 MESH_MAX_PLINKS - sdata->local->num_sta)) > 0; 310 } 311 312 static inline void mesh_path_activate(struct mesh_path *mpath) 313 { 314 mpath->flags |= MESH_PATH_ACTIVE | MESH_PATH_RESOLVED; 315 } 316 317 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata) 318 { 319 return sdata->u.mesh.mesh_pp_id == IEEE80211_PATH_PROTOCOL_HWMP; 320 } 321 322 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local); 323 324 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata); 325 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata); 326 void mesh_plink_quiesce(struct sta_info *sta); 327 void mesh_plink_restart(struct sta_info *sta); 328 #else 329 #define mesh_allocated 0 330 static inline void 331 ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local) {} 332 static inline void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata) 333 {} 334 static inline void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata) 335 {} 336 static inline void mesh_plink_quiesce(struct sta_info *sta) {} 337 static inline void mesh_plink_restart(struct sta_info *sta) {} 338 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata) 339 { return false; } 340 #endif 341 342 #endif /* IEEE80211S_H */ 343