1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (c) 2008, 2009 open80211s Ltd. 4 * Authors: Luis Carlos Cobo <luisca@cozybit.com> 5 * Javier Cardona <javier@cozybit.com> 6 */ 7 8 #ifndef IEEE80211S_H 9 #define IEEE80211S_H 10 11 #include <linux/types.h> 12 #include <linux/jhash.h> 13 #include "ieee80211_i.h" 14 15 16 /* Data structures */ 17 18 /** 19 * enum mesh_path_flags - mac80211 mesh path flags 20 * 21 * @MESH_PATH_ACTIVE: the mesh path can be used for forwarding 22 * @MESH_PATH_RESOLVING: the discovery process is running for this mesh path 23 * @MESH_PATH_SN_VALID: the mesh path contains a valid destination sequence 24 * number 25 * @MESH_PATH_FIXED: the mesh path has been manually set and should not be 26 * modified 27 * @MESH_PATH_RESOLVED: the mesh path can has been resolved 28 * @MESH_PATH_REQ_QUEUED: there is an unsent path request for this destination 29 * already queued up, waiting for the discovery process to start. 30 * @MESH_PATH_DELETED: the mesh path has been deleted and should no longer 31 * be used 32 * 33 * MESH_PATH_RESOLVED is used by the mesh path timer to 34 * decide when to stop or cancel the mesh path discovery. 35 */ 36 enum mesh_path_flags { 37 MESH_PATH_ACTIVE = BIT(0), 38 MESH_PATH_RESOLVING = BIT(1), 39 MESH_PATH_SN_VALID = BIT(2), 40 MESH_PATH_FIXED = BIT(3), 41 MESH_PATH_RESOLVED = BIT(4), 42 MESH_PATH_REQ_QUEUED = BIT(5), 43 MESH_PATH_DELETED = BIT(6), 44 }; 45 46 /** 47 * enum mesh_deferred_task_flags - mac80211 mesh deferred tasks 48 * 49 * 50 * 51 * @MESH_WORK_HOUSEKEEPING: run the periodic mesh housekeeping tasks 52 * @MESH_WORK_ROOT: the mesh root station needs to send a frame 53 * @MESH_WORK_DRIFT_ADJUST: time to compensate for clock drift relative to other 54 * mesh nodes 55 * @MESH_WORK_MBSS_CHANGED: rebuild beacon and notify driver of BSS changes 56 */ 57 enum mesh_deferred_task_flags { 58 MESH_WORK_HOUSEKEEPING, 59 MESH_WORK_ROOT, 60 MESH_WORK_DRIFT_ADJUST, 61 MESH_WORK_MBSS_CHANGED, 62 }; 63 64 /** 65 * struct mesh_path - mac80211 mesh path structure 66 * 67 * @dst: mesh path destination mac address 68 * @mpp: mesh proxy mac address 69 * @rhash: rhashtable list pointer 70 * @walk_list: linked list containing all mesh_path objects. 71 * @gate_list: list pointer for known gates list 72 * @sdata: mesh subif 73 * @next_hop: mesh neighbor to which frames for this destination will be 74 * forwarded 75 * @timer: mesh path discovery timer 76 * @frame_queue: pending queue for frames sent to this destination while the 77 * path is unresolved 78 * @rcu: rcu head for freeing mesh path 79 * @sn: target sequence number 80 * @metric: current metric to this destination 81 * @hop_count: hops to destination 82 * @exp_time: in jiffies, when the path will expire or when it expired 83 * @discovery_timeout: timeout (lapse in jiffies) used for the last discovery 84 * retry 85 * @discovery_retries: number of discovery retries 86 * @flags: mesh path flags, as specified on &enum mesh_path_flags 87 * @state_lock: mesh path state lock used to protect changes to the 88 * mpath itself. No need to take this lock when adding or removing 89 * an mpath to a hash bucket on a path table. 90 * @rann_snd_addr: the RANN sender address 91 * @rann_metric: the aggregated path metric towards the root node 92 * @last_preq_to_root: Timestamp of last PREQ sent to root 93 * @is_root: the destination station of this path is a root node 94 * @is_gate: the destination station of this path is a mesh gate 95 * @path_change_count: the number of path changes to destination 96 * 97 * 98 * The dst address is unique in the mesh path table. Since the mesh_path is 99 * protected by RCU, deleting the next_hop STA must remove / substitute the 100 * mesh_path structure and wait until that is no longer reachable before 101 * destroying the STA completely. 102 */ 103 struct mesh_path { 104 u8 dst[ETH_ALEN]; 105 u8 mpp[ETH_ALEN]; /* used for MPP or MAP */ 106 struct rhash_head rhash; 107 struct hlist_node walk_list; 108 struct hlist_node gate_list; 109 struct ieee80211_sub_if_data *sdata; 110 struct sta_info __rcu *next_hop; 111 struct timer_list timer; 112 struct sk_buff_head frame_queue; 113 struct rcu_head rcu; 114 u32 sn; 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; 122 u8 rann_snd_addr[ETH_ALEN]; 123 u32 rann_metric; 124 unsigned long last_preq_to_root; 125 bool is_root; 126 bool is_gate; 127 u32 path_change_count; 128 }; 129 130 /** 131 * struct mesh_table 132 * 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 * @gates_lock: protects updates to known_gates 136 * @rhead: the rhashtable containing struct mesh_paths, keyed by dest addr 137 * @walk_head: linked list containging all mesh_path objects 138 * @walk_lock: lock protecting walk_head 139 * @entries: number of entries in the table 140 */ 141 struct mesh_table { 142 struct hlist_head known_gates; 143 spinlock_t gates_lock; 144 struct rhashtable rhead; 145 struct hlist_head walk_head; 146 spinlock_t walk_lock; 147 atomic_t entries; /* Up to MAX_MESH_NEIGHBOURS */ 148 }; 149 150 /* Recent multicast cache */ 151 /* RMC_BUCKETS must be a power of 2, maximum 256 */ 152 #define RMC_BUCKETS 256 153 #define RMC_QUEUE_MAX_LEN 4 154 #define RMC_TIMEOUT (3 * HZ) 155 156 /** 157 * struct rmc_entry - entry in the Recent Multicast Cache 158 * 159 * @seqnum: mesh sequence number of the frame 160 * @exp_time: expiration time of the entry, in jiffies 161 * @sa: source address of the frame 162 * @list: hashtable list pointer 163 * 164 * The Recent Multicast Cache keeps track of the latest multicast frames that 165 * have been received by a mesh interface and discards received multicast frames 166 * that are found in the cache. 167 */ 168 struct rmc_entry { 169 struct hlist_node list; 170 unsigned long exp_time; 171 u32 seqnum; 172 u8 sa[ETH_ALEN]; 173 }; 174 175 struct mesh_rmc { 176 struct hlist_head bucket[RMC_BUCKETS]; 177 u32 idx_mask; 178 }; 179 180 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ) 181 182 #define MESH_PATH_EXPIRE (600 * HZ) 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 /* Number of frames buffered per destination for unresolved destinations */ 191 #define MESH_FRAME_QUEUE_LEN 10 192 193 /* Public interfaces */ 194 /* Various */ 195 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, 196 const u8 *da, const u8 *sa); 197 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata, 198 struct ieee80211s_hdr *meshhdr, 199 const char *addr4or5, const char *addr6); 200 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, 201 const u8 *addr, struct ieee80211s_hdr *mesh_hdr); 202 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata, 203 struct ieee802_11_elems *ie); 204 void mesh_ids_set_default(struct ieee80211_if_mesh *mesh); 205 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata, 206 struct sk_buff *skb); 207 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, 208 struct sk_buff *skb); 209 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, 210 struct sk_buff *skb); 211 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata, 212 struct sk_buff *skb); 213 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata, 214 struct sk_buff *skb); 215 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata, 216 struct sk_buff *skb); 217 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata, 218 struct sk_buff *skb); 219 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata, 220 struct sk_buff *skb); 221 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata); 222 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata); 223 void ieee80211s_init(void); 224 void ieee80211s_update_metric(struct ieee80211_local *local, 225 struct sta_info *sta, 226 struct ieee80211_tx_status *st); 227 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata); 228 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata); 229 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata); 230 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata); 231 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh); 232 const struct ieee80211_mesh_sync_ops *ieee80211_mesh_sync_ops_get(u8 method); 233 /* wrapper for ieee80211_bss_info_change_notify() */ 234 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata, 235 u32 changed); 236 237 /* mesh power save */ 238 u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata); 239 u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta, 240 enum nl80211_mesh_power_mode pm); 241 void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata, 242 struct sta_info *sta, 243 struct ieee80211_hdr *hdr); 244 void ieee80211_mps_sta_status_update(struct sta_info *sta); 245 void ieee80211_mps_rx_h_sta_process(struct sta_info *sta, 246 struct ieee80211_hdr *hdr); 247 void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta, 248 bool tx, bool acked); 249 void ieee80211_mps_frame_release(struct sta_info *sta, 250 struct ieee802_11_elems *elems); 251 252 /* Mesh paths */ 253 int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata, 254 struct sk_buff *skb); 255 int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, 256 struct sk_buff *skb); 257 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata); 258 struct mesh_path *mesh_path_lookup(struct ieee80211_sub_if_data *sdata, 259 const u8 *dst); 260 struct mesh_path *mpp_path_lookup(struct ieee80211_sub_if_data *sdata, 261 const u8 *dst); 262 int mpp_path_add(struct ieee80211_sub_if_data *sdata, 263 const u8 *dst, const u8 *mpp); 264 struct mesh_path * 265 mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx); 266 struct mesh_path * 267 mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx); 268 void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop); 269 void mesh_path_expire(struct ieee80211_sub_if_data *sdata); 270 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, 271 struct ieee80211_mgmt *mgmt, size_t len); 272 struct mesh_path * 273 mesh_path_add(struct ieee80211_sub_if_data *sdata, const u8 *dst); 274 275 int mesh_path_add_gate(struct mesh_path *mpath); 276 int mesh_path_send_to_gates(struct mesh_path *mpath); 277 int mesh_gate_num(struct ieee80211_sub_if_data *sdata); 278 u32 airtime_link_metric_get(struct ieee80211_local *local, 279 struct sta_info *sta); 280 281 /* Mesh plinks */ 282 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata, 283 u8 *hw_addr, struct ieee802_11_elems *ie, 284 struct ieee80211_rx_status *rx_status); 285 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie); 286 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata); 287 void mesh_plink_timer(struct timer_list *t); 288 void mesh_plink_broken(struct sta_info *sta); 289 u32 mesh_plink_deactivate(struct sta_info *sta); 290 u32 mesh_plink_open(struct sta_info *sta); 291 u32 mesh_plink_block(struct sta_info *sta); 292 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, 293 struct ieee80211_mgmt *mgmt, size_t len, 294 struct ieee80211_rx_status *rx_status); 295 void mesh_sta_cleanup(struct sta_info *sta); 296 297 /* Private interfaces */ 298 /* Mesh paths */ 299 int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata, 300 u8 ttl, const u8 *target, u32 target_sn, 301 u16 target_rcode, const u8 *ra); 302 void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta); 303 void mesh_path_flush_pending(struct mesh_path *mpath); 304 void mesh_path_tx_pending(struct mesh_path *mpath); 305 int mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata); 306 void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata); 307 int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr); 308 void mesh_path_timer(struct timer_list *t); 309 void mesh_path_flush_by_nexthop(struct sta_info *sta); 310 void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata, 311 struct sk_buff *skb); 312 void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata); 313 314 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt); 315 316 #ifdef CONFIG_MAC80211_MESH 317 static inline 318 u32 mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata) 319 { 320 atomic_inc(&sdata->u.mesh.estab_plinks); 321 return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON; 322 } 323 324 static inline 325 u32 mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata) 326 { 327 atomic_dec(&sdata->u.mesh.estab_plinks); 328 return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON; 329 } 330 331 static inline int mesh_plink_free_count(struct ieee80211_sub_if_data *sdata) 332 { 333 return sdata->u.mesh.mshcfg.dot11MeshMaxPeerLinks - 334 atomic_read(&sdata->u.mesh.estab_plinks); 335 } 336 337 static inline bool mesh_plink_availables(struct ieee80211_sub_if_data *sdata) 338 { 339 return (min_t(long, mesh_plink_free_count(sdata), 340 MESH_MAX_PLINKS - sdata->local->num_sta)) > 0; 341 } 342 343 static inline void mesh_path_activate(struct mesh_path *mpath) 344 { 345 mpath->flags |= MESH_PATH_ACTIVE | MESH_PATH_RESOLVED; 346 } 347 348 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata) 349 { 350 return sdata->u.mesh.mesh_pp_id == IEEE80211_PATH_PROTOCOL_HWMP; 351 } 352 353 void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata); 354 void mesh_sync_adjust_tsf(struct ieee80211_sub_if_data *sdata); 355 void ieee80211s_stop(void); 356 #else 357 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata) 358 { return false; } 359 static inline void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata) 360 {} 361 static inline void ieee80211s_stop(void) {} 362 #endif 363 364 #endif /* IEEE80211S_H */ 365