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 /* Recent multicast cache */ 131 /* RMC_BUCKETS must be a power of 2, maximum 256 */ 132 #define RMC_BUCKETS 256 133 #define RMC_QUEUE_MAX_LEN 4 134 #define RMC_TIMEOUT (3 * HZ) 135 136 /** 137 * struct rmc_entry - entry in the Recent Multicast Cache 138 * 139 * @seqnum: mesh sequence number of the frame 140 * @exp_time: expiration time of the entry, in jiffies 141 * @sa: source address of the frame 142 * @list: hashtable list pointer 143 * 144 * The Recent Multicast Cache keeps track of the latest multicast frames that 145 * have been received by a mesh interface and discards received multicast frames 146 * that are found in the cache. 147 */ 148 struct rmc_entry { 149 struct hlist_node list; 150 unsigned long exp_time; 151 u32 seqnum; 152 u8 sa[ETH_ALEN]; 153 }; 154 155 struct mesh_rmc { 156 struct hlist_head bucket[RMC_BUCKETS]; 157 u32 idx_mask; 158 }; 159 160 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ) 161 162 #define MESH_PATH_EXPIRE (600 * HZ) 163 164 /* Default maximum number of plinks per interface */ 165 #define MESH_MAX_PLINKS 256 166 167 /* Maximum number of paths per interface */ 168 #define MESH_MAX_MPATHS 1024 169 170 /* Number of frames buffered per destination for unresolved destinations */ 171 #define MESH_FRAME_QUEUE_LEN 10 172 173 /* Public interfaces */ 174 /* Various */ 175 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, 176 const u8 *da, const u8 *sa); 177 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata, 178 struct ieee80211s_hdr *meshhdr, 179 const char *addr4or5, const char *addr6); 180 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, 181 const u8 *addr, struct ieee80211s_hdr *mesh_hdr); 182 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata, 183 struct ieee802_11_elems *ie); 184 void mesh_ids_set_default(struct ieee80211_if_mesh *mesh); 185 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata, 186 struct sk_buff *skb); 187 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, 188 struct sk_buff *skb); 189 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, 190 struct sk_buff *skb); 191 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata, 192 struct sk_buff *skb); 193 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata, 194 struct sk_buff *skb); 195 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata, 196 struct sk_buff *skb); 197 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata, 198 struct sk_buff *skb); 199 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata, 200 struct sk_buff *skb); 201 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata, 202 struct sk_buff *skb, u8 ie_len); 203 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata, 204 struct sk_buff *skb); 205 int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata, 206 struct sk_buff *skb); 207 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata); 208 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata); 209 void ieee80211s_init(void); 210 void ieee80211s_update_metric(struct ieee80211_local *local, 211 struct sta_info *sta, 212 struct ieee80211_tx_status *st); 213 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata); 214 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata); 215 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata); 216 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata); 217 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh); 218 const struct ieee80211_mesh_sync_ops *ieee80211_mesh_sync_ops_get(u8 method); 219 /* wrapper for ieee80211_bss_info_change_notify() */ 220 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata, 221 u32 changed); 222 223 /* mesh power save */ 224 u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata); 225 u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta, 226 enum nl80211_mesh_power_mode pm); 227 void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata, 228 struct sta_info *sta, 229 struct ieee80211_hdr *hdr); 230 void ieee80211_mps_sta_status_update(struct sta_info *sta); 231 void ieee80211_mps_rx_h_sta_process(struct sta_info *sta, 232 struct ieee80211_hdr *hdr); 233 void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta, 234 bool tx, bool acked); 235 void ieee80211_mps_frame_release(struct sta_info *sta, 236 struct ieee802_11_elems *elems); 237 238 /* Mesh paths */ 239 int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata, 240 struct sk_buff *skb); 241 int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, 242 struct sk_buff *skb); 243 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata); 244 struct mesh_path *mesh_path_lookup(struct ieee80211_sub_if_data *sdata, 245 const u8 *dst); 246 struct mesh_path *mpp_path_lookup(struct ieee80211_sub_if_data *sdata, 247 const u8 *dst); 248 int mpp_path_add(struct ieee80211_sub_if_data *sdata, 249 const u8 *dst, const u8 *mpp); 250 struct mesh_path * 251 mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx); 252 struct mesh_path * 253 mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx); 254 void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop); 255 void mesh_path_expire(struct ieee80211_sub_if_data *sdata); 256 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, 257 struct ieee80211_mgmt *mgmt, size_t len); 258 struct mesh_path * 259 mesh_path_add(struct ieee80211_sub_if_data *sdata, const u8 *dst); 260 261 int mesh_path_add_gate(struct mesh_path *mpath); 262 int mesh_path_send_to_gates(struct mesh_path *mpath); 263 int mesh_gate_num(struct ieee80211_sub_if_data *sdata); 264 u32 airtime_link_metric_get(struct ieee80211_local *local, 265 struct sta_info *sta); 266 267 /* Mesh plinks */ 268 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata, 269 u8 *hw_addr, struct ieee802_11_elems *ie, 270 struct ieee80211_rx_status *rx_status); 271 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie); 272 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata); 273 void mesh_plink_timer(struct timer_list *t); 274 void mesh_plink_broken(struct sta_info *sta); 275 u32 mesh_plink_deactivate(struct sta_info *sta); 276 u32 mesh_plink_open(struct sta_info *sta); 277 u32 mesh_plink_block(struct sta_info *sta); 278 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, 279 struct ieee80211_mgmt *mgmt, size_t len, 280 struct ieee80211_rx_status *rx_status); 281 void mesh_sta_cleanup(struct sta_info *sta); 282 283 /* Private interfaces */ 284 /* Mesh paths */ 285 int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata, 286 u8 ttl, const u8 *target, u32 target_sn, 287 u16 target_rcode, const u8 *ra); 288 void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta); 289 void mesh_path_flush_pending(struct mesh_path *mpath); 290 void mesh_path_tx_pending(struct mesh_path *mpath); 291 void mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata); 292 void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata); 293 int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr); 294 void mesh_path_timer(struct timer_list *t); 295 void mesh_path_flush_by_nexthop(struct sta_info *sta); 296 void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata, 297 struct sk_buff *skb); 298 void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata); 299 300 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt); 301 302 #ifdef CONFIG_MAC80211_MESH 303 static inline 304 u32 mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata) 305 { 306 atomic_inc(&sdata->u.mesh.estab_plinks); 307 return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON; 308 } 309 310 static inline 311 u32 mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata) 312 { 313 atomic_dec(&sdata->u.mesh.estab_plinks); 314 return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON; 315 } 316 317 static inline int mesh_plink_free_count(struct ieee80211_sub_if_data *sdata) 318 { 319 return sdata->u.mesh.mshcfg.dot11MeshMaxPeerLinks - 320 atomic_read(&sdata->u.mesh.estab_plinks); 321 } 322 323 static inline bool mesh_plink_availables(struct ieee80211_sub_if_data *sdata) 324 { 325 return (min_t(long, mesh_plink_free_count(sdata), 326 MESH_MAX_PLINKS - sdata->local->num_sta)) > 0; 327 } 328 329 static inline void mesh_path_activate(struct mesh_path *mpath) 330 { 331 mpath->flags |= MESH_PATH_ACTIVE | MESH_PATH_RESOLVED; 332 } 333 334 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata) 335 { 336 return sdata->u.mesh.mesh_pp_id == IEEE80211_PATH_PROTOCOL_HWMP; 337 } 338 339 void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata); 340 void mesh_sync_adjust_tsf(struct ieee80211_sub_if_data *sdata); 341 void ieee80211s_stop(void); 342 #else 343 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata) 344 { return false; } 345 static inline void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata) 346 {} 347 static inline void ieee80211s_stop(void) {} 348 #endif 349 350 #endif /* IEEE80211S_H */ 351