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 * @MESH_PATH_ACTIVE: the mesh path can be used for forwarding 25 * @MESH_PATH_RESOLVING: the discovery process is running for this mesh path 26 * @MESH_PATH_SN_VALID: the mesh path contains a valid destination sequence 27 * number 28 * @MESH_PATH_FIXED: the mesh path has been manually set and should not be 29 * modified 30 * @MESH_PATH_RESOLVED: the mesh path can has been resolved 31 * @MESH_PATH_REQ_QUEUED: there is an unsent path request for this destination 32 * already queued up, waiting for the discovery process to start. 33 * @MESH_PATH_DELETED: the mesh path has been deleted and should no longer 34 * be used 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 MESH_PATH_DELETED = BIT(6), 47 }; 48 49 /** 50 * enum mesh_deferred_task_flags - mac80211 mesh deferred tasks 51 * 52 * 53 * 54 * @MESH_WORK_HOUSEKEEPING: run the periodic mesh housekeeping tasks 55 * @MESH_WORK_ROOT: the mesh root station needs to send a frame 56 * @MESH_WORK_DRIFT_ADJUST: time to compensate for clock drift relative to other 57 * mesh nodes 58 * @MESH_WORK_MBSS_CHANGED: rebuild beacon and notify driver of BSS changes 59 */ 60 enum mesh_deferred_task_flags { 61 MESH_WORK_HOUSEKEEPING, 62 MESH_WORK_ROOT, 63 MESH_WORK_DRIFT_ADJUST, 64 MESH_WORK_MBSS_CHANGED, 65 }; 66 67 /** 68 * struct mesh_path - mac80211 mesh path structure 69 * 70 * @dst: mesh path destination mac address 71 * @mpp: mesh proxy mac address 72 * @rhash: rhashtable list pointer 73 * @walk_list: linked list containing all mesh_path objects. 74 * @gate_list: list pointer for known gates list 75 * @sdata: mesh subif 76 * @next_hop: mesh neighbor to which frames for this destination will be 77 * forwarded 78 * @timer: mesh path discovery timer 79 * @frame_queue: pending queue for frames sent to this destination while the 80 * path is unresolved 81 * @rcu: rcu head for freeing mesh path 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 * @path_change_count: the number of path changes to destination 99 * 100 * 101 * The dst address is unique in the mesh path table. Since the mesh_path is 102 * protected by RCU, deleting the next_hop STA must remove / substitute the 103 * mesh_path structure and wait until that is no longer reachable before 104 * destroying the STA completely. 105 */ 106 struct mesh_path { 107 u8 dst[ETH_ALEN]; 108 u8 mpp[ETH_ALEN]; /* used for MPP or MAP */ 109 struct rhash_head rhash; 110 struct hlist_node walk_list; 111 struct hlist_node gate_list; 112 struct ieee80211_sub_if_data *sdata; 113 struct sta_info __rcu *next_hop; 114 struct timer_list timer; 115 struct sk_buff_head frame_queue; 116 struct rcu_head rcu; 117 u32 sn; 118 u32 metric; 119 u8 hop_count; 120 unsigned long exp_time; 121 u32 discovery_timeout; 122 u8 discovery_retries; 123 enum mesh_path_flags flags; 124 spinlock_t state_lock; 125 u8 rann_snd_addr[ETH_ALEN]; 126 u32 rann_metric; 127 unsigned long last_preq_to_root; 128 bool is_root; 129 bool is_gate; 130 u32 path_change_count; 131 }; 132 133 /** 134 * struct mesh_table 135 * 136 * @known_gates: list of known mesh gates and their mpaths by the station. The 137 * gate's mpath may or may not be resolved and active. 138 * @gates_lock: protects updates to known_gates 139 * @rhead: the rhashtable containing struct mesh_paths, keyed by dest addr 140 * @walk_head: linked list containging all mesh_path objects 141 * @walk_lock: lock protecting walk_head 142 * @entries: number of entries in the table 143 */ 144 struct mesh_table { 145 struct hlist_head known_gates; 146 spinlock_t gates_lock; 147 struct rhashtable rhead; 148 struct hlist_head walk_head; 149 spinlock_t walk_lock; 150 atomic_t entries; /* Up to MAX_MESH_NEIGHBOURS */ 151 }; 152 153 /* Recent multicast cache */ 154 /* RMC_BUCKETS must be a power of 2, maximum 256 */ 155 #define RMC_BUCKETS 256 156 #define RMC_QUEUE_MAX_LEN 4 157 #define RMC_TIMEOUT (3 * HZ) 158 159 /** 160 * struct rmc_entry - entry in the Recent Multicast Cache 161 * 162 * @seqnum: mesh sequence number of the frame 163 * @exp_time: expiration time of the entry, in jiffies 164 * @sa: source address of the frame 165 * @list: hashtable list pointer 166 * 167 * The Recent Multicast Cache keeps track of the latest multicast frames that 168 * have been received by a mesh interface and discards received multicast frames 169 * that are found in the cache. 170 */ 171 struct rmc_entry { 172 struct hlist_node list; 173 unsigned long exp_time; 174 u32 seqnum; 175 u8 sa[ETH_ALEN]; 176 }; 177 178 struct mesh_rmc { 179 struct hlist_head bucket[RMC_BUCKETS]; 180 u32 idx_mask; 181 }; 182 183 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ) 184 185 #define MESH_PATH_EXPIRE (600 * HZ) 186 187 /* Default maximum number of plinks per interface */ 188 #define MESH_MAX_PLINKS 256 189 190 /* Maximum number of paths per interface */ 191 #define MESH_MAX_MPATHS 1024 192 193 /* Number of frames buffered per destination for unresolved destinations */ 194 #define MESH_FRAME_QUEUE_LEN 10 195 196 /* Public interfaces */ 197 /* Various */ 198 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, 199 const u8 *da, const u8 *sa); 200 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata, 201 struct ieee80211s_hdr *meshhdr, 202 const char *addr4or5, const char *addr6); 203 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, 204 const u8 *addr, struct ieee80211s_hdr *mesh_hdr); 205 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata, 206 struct ieee802_11_elems *ie); 207 void mesh_ids_set_default(struct ieee80211_if_mesh *mesh); 208 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata, 209 struct sk_buff *skb); 210 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, 211 struct sk_buff *skb); 212 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, 213 struct sk_buff *skb); 214 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata, 215 struct sk_buff *skb); 216 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata, 217 struct sk_buff *skb); 218 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata, 219 struct sk_buff *skb); 220 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata, 221 struct sk_buff *skb); 222 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata, 223 struct sk_buff *skb); 224 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata); 225 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata); 226 void ieee80211s_init(void); 227 void ieee80211s_update_metric(struct ieee80211_local *local, 228 struct sta_info *sta, 229 struct ieee80211_tx_status *st); 230 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata); 231 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata); 232 int 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 const struct ieee80211_mesh_sync_ops *ieee80211_mesh_sync_ops_get(u8 method); 236 /* wrapper for ieee80211_bss_info_change_notify() */ 237 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata, 238 u32 changed); 239 240 /* mesh power save */ 241 u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata); 242 u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta, 243 enum nl80211_mesh_power_mode pm); 244 void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata, 245 struct sta_info *sta, 246 struct ieee80211_hdr *hdr); 247 void ieee80211_mps_sta_status_update(struct sta_info *sta); 248 void ieee80211_mps_rx_h_sta_process(struct sta_info *sta, 249 struct ieee80211_hdr *hdr); 250 void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta, 251 bool tx, bool acked); 252 void ieee80211_mps_frame_release(struct sta_info *sta, 253 struct ieee802_11_elems *elems); 254 255 /* Mesh paths */ 256 int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata, 257 struct sk_buff *skb); 258 int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, 259 struct sk_buff *skb); 260 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata); 261 struct mesh_path *mesh_path_lookup(struct ieee80211_sub_if_data *sdata, 262 const u8 *dst); 263 struct mesh_path *mpp_path_lookup(struct ieee80211_sub_if_data *sdata, 264 const u8 *dst); 265 int mpp_path_add(struct ieee80211_sub_if_data *sdata, 266 const u8 *dst, const u8 *mpp); 267 struct mesh_path * 268 mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx); 269 struct mesh_path * 270 mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx); 271 void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop); 272 void mesh_path_expire(struct ieee80211_sub_if_data *sdata); 273 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, 274 struct ieee80211_mgmt *mgmt, size_t len); 275 struct mesh_path * 276 mesh_path_add(struct ieee80211_sub_if_data *sdata, const u8 *dst); 277 278 int mesh_path_add_gate(struct mesh_path *mpath); 279 int mesh_path_send_to_gates(struct mesh_path *mpath); 280 int mesh_gate_num(struct ieee80211_sub_if_data *sdata); 281 u32 airtime_link_metric_get(struct ieee80211_local *local, 282 struct sta_info *sta); 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 struct ieee80211_rx_status *rx_status); 288 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie); 289 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata); 290 void mesh_plink_timer(struct timer_list *t); 291 void mesh_plink_broken(struct sta_info *sta); 292 u32 mesh_plink_deactivate(struct sta_info *sta); 293 u32 mesh_plink_open(struct sta_info *sta); 294 u32 mesh_plink_block(struct sta_info *sta); 295 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, 296 struct ieee80211_mgmt *mgmt, size_t len, 297 struct ieee80211_rx_status *rx_status); 298 void mesh_sta_cleanup(struct sta_info *sta); 299 300 /* Private interfaces */ 301 /* Mesh paths */ 302 int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata, 303 u8 ttl, const u8 *target, u32 target_sn, 304 u16 target_rcode, const u8 *ra); 305 void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta); 306 void mesh_path_flush_pending(struct mesh_path *mpath); 307 void mesh_path_tx_pending(struct mesh_path *mpath); 308 int mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata); 309 void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata); 310 int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr); 311 void mesh_path_timer(struct timer_list *t); 312 void mesh_path_flush_by_nexthop(struct sta_info *sta); 313 void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata, 314 struct sk_buff *skb); 315 void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata); 316 317 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt); 318 319 #ifdef CONFIG_MAC80211_MESH 320 static inline 321 u32 mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata) 322 { 323 atomic_inc(&sdata->u.mesh.estab_plinks); 324 return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON; 325 } 326 327 static inline 328 u32 mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata) 329 { 330 atomic_dec(&sdata->u.mesh.estab_plinks); 331 return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON; 332 } 333 334 static inline int mesh_plink_free_count(struct ieee80211_sub_if_data *sdata) 335 { 336 return sdata->u.mesh.mshcfg.dot11MeshMaxPeerLinks - 337 atomic_read(&sdata->u.mesh.estab_plinks); 338 } 339 340 static inline bool mesh_plink_availables(struct ieee80211_sub_if_data *sdata) 341 { 342 return (min_t(long, mesh_plink_free_count(sdata), 343 MESH_MAX_PLINKS - sdata->local->num_sta)) > 0; 344 } 345 346 static inline void mesh_path_activate(struct mesh_path *mpath) 347 { 348 mpath->flags |= MESH_PATH_ACTIVE | MESH_PATH_RESOLVED; 349 } 350 351 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata) 352 { 353 return sdata->u.mesh.mesh_pp_id == IEEE80211_PATH_PROTOCOL_HWMP; 354 } 355 356 void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata); 357 void mesh_sync_adjust_tsf(struct ieee80211_sub_if_data *sdata); 358 void ieee80211s_stop(void); 359 #else 360 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata) 361 { return false; } 362 static inline void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata) 363 {} 364 static inline void ieee80211s_stop(void) {} 365 #endif 366 367 #endif /* IEEE80211S_H */ 368