1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (c) 2008, 2009 open80211s Ltd. 4 * Copyright (C) 2023-2024 Intel Corporation 5 * Authors: Luis Carlos Cobo <luisca@cozybit.com> 6 * Javier Cardona <javier@cozybit.com> 7 */ 8 9 #ifndef IEEE80211S_H 10 #define IEEE80211S_H 11 12 #include <linux/types.h> 13 #include <linux/jhash.h> 14 #include "ieee80211_i.h" 15 16 17 /* Data structures */ 18 19 /** 20 * enum mesh_path_flags - mac80211 mesh path flags 21 * 22 * @MESH_PATH_ACTIVE: the mesh path can be used for forwarding 23 * @MESH_PATH_RESOLVING: the discovery process is running for this mesh path 24 * @MESH_PATH_SN_VALID: the mesh path contains a valid destination sequence 25 * number 26 * @MESH_PATH_FIXED: the mesh path has been manually set and should not be 27 * modified 28 * @MESH_PATH_RESOLVED: the mesh path can has been resolved 29 * @MESH_PATH_REQ_QUEUED: there is an unsent path request for this destination 30 * already queued up, waiting for the discovery process to start. 31 * @MESH_PATH_DELETED: the mesh path has been deleted and should no longer 32 * be used 33 * 34 * MESH_PATH_RESOLVED is used by the mesh path timer to 35 * decide when to stop or cancel the mesh path discovery. 36 */ 37 enum mesh_path_flags { 38 MESH_PATH_ACTIVE = BIT(0), 39 MESH_PATH_RESOLVING = BIT(1), 40 MESH_PATH_SN_VALID = BIT(2), 41 MESH_PATH_FIXED = BIT(3), 42 MESH_PATH_RESOLVED = BIT(4), 43 MESH_PATH_REQ_QUEUED = BIT(5), 44 MESH_PATH_DELETED = BIT(6), 45 }; 46 47 /** 48 * enum mesh_deferred_task_flags - mac80211 mesh deferred tasks 49 * 50 * 51 * 52 * @MESH_WORK_HOUSEKEEPING: run the periodic mesh housekeeping tasks 53 * @MESH_WORK_ROOT: the mesh root station needs to send a frame 54 * @MESH_WORK_DRIFT_ADJUST: time to compensate for clock drift relative to other 55 * mesh nodes 56 * @MESH_WORK_MBSS_CHANGED: rebuild beacon and notify driver of BSS changes 57 */ 58 enum mesh_deferred_task_flags { 59 MESH_WORK_HOUSEKEEPING, 60 MESH_WORK_ROOT, 61 MESH_WORK_DRIFT_ADJUST, 62 MESH_WORK_MBSS_CHANGED, 63 }; 64 65 /** 66 * struct mesh_path - mac80211 mesh path structure 67 * 68 * @dst: mesh path destination mac address 69 * @mpp: mesh proxy mac address 70 * @rhash: rhashtable list pointer 71 * @walk_list: linked list containing all mesh_path objects. 72 * @gate_list: list pointer for known gates list 73 * @sdata: mesh subif 74 * @next_hop: mesh neighbor to which frames for this destination will be 75 * forwarded 76 * @timer: mesh path discovery timer 77 * @frame_queue: pending queue for frames sent to this destination while the 78 * path is unresolved 79 * @rcu: rcu head for freeing mesh path 80 * @sn: target sequence number 81 * @metric: current metric to this destination 82 * @hop_count: hops to destination 83 * @exp_time: in jiffies, when the path will expire or when it expired 84 * @discovery_timeout: timeout (lapse in jiffies) used for the last discovery 85 * retry 86 * @discovery_retries: number of discovery retries 87 * @flags: mesh path flags, as specified on &enum mesh_path_flags 88 * @state_lock: mesh path state lock used to protect changes to the 89 * mpath itself. No need to take this lock when adding or removing 90 * an mpath to a hash bucket on a path table. 91 * @rann_snd_addr: the RANN sender address 92 * @rann_metric: the aggregated path metric towards the root node 93 * @last_preq_to_root: Timestamp of last PREQ sent to root 94 * @is_root: the destination station of this path is a root node 95 * @is_gate: the destination station of this path is a mesh gate 96 * @path_change_count: the number of path changes to destination 97 * @fast_tx_check: timestamp of last fast-xmit enable attempt 98 * 99 * 100 * The dst address is unique in the mesh path table. Since the mesh_path is 101 * protected by RCU, deleting the next_hop STA must remove / substitute the 102 * mesh_path structure and wait until that is no longer reachable before 103 * destroying the STA completely. 104 */ 105 struct mesh_path { 106 u8 dst[ETH_ALEN]; 107 u8 mpp[ETH_ALEN]; /* used for MPP or MAP */ 108 struct rhash_head rhash; 109 struct hlist_node walk_list; 110 struct hlist_node gate_list; 111 struct ieee80211_sub_if_data *sdata; 112 struct sta_info __rcu *next_hop; 113 struct timer_list timer; 114 struct sk_buff_head frame_queue; 115 struct rcu_head rcu; 116 u32 sn; 117 u32 metric; 118 u8 hop_count; 119 unsigned long exp_time; 120 u32 discovery_timeout; 121 u8 discovery_retries; 122 enum mesh_path_flags flags; 123 spinlock_t state_lock; 124 u8 rann_snd_addr[ETH_ALEN]; 125 u32 rann_metric; 126 unsigned long last_preq_to_root; 127 unsigned long fast_tx_check; 128 bool is_root; 129 bool is_gate; 130 u32 path_change_count; 131 }; 132 133 #define MESH_FAST_TX_CACHE_MAX_SIZE 512 134 #define MESH_FAST_TX_CACHE_THRESHOLD_SIZE 384 135 #define MESH_FAST_TX_CACHE_TIMEOUT 8000 /* msecs */ 136 137 /** 138 * struct ieee80211_mesh_fast_tx - cached mesh fast tx entry 139 * @rhash: rhashtable pointer 140 * @addr_key: The Ethernet DA which is the key for this entry 141 * @fast_tx: base fast_tx data 142 * @hdr: cached mesh and rfc1042 headers 143 * @hdrlen: length of mesh + rfc1042 144 * @walk_list: list containing all the fast tx entries 145 * @mpath: mesh path corresponding to the Mesh DA 146 * @mppath: MPP entry corresponding to this DA 147 * @timestamp: Last used time of this entry 148 */ 149 struct ieee80211_mesh_fast_tx { 150 struct rhash_head rhash; 151 u8 addr_key[ETH_ALEN] __aligned(2); 152 153 struct ieee80211_fast_tx fast_tx; 154 u8 hdr[sizeof(struct ieee80211s_hdr) + sizeof(rfc1042_header)]; 155 u16 hdrlen; 156 157 struct mesh_path *mpath, *mppath; 158 struct hlist_node walk_list; 159 unsigned long timestamp; 160 }; 161 162 /* Recent multicast cache */ 163 /* RMC_BUCKETS must be a power of 2, maximum 256 */ 164 #define RMC_BUCKETS 256 165 #define RMC_QUEUE_MAX_LEN 4 166 #define RMC_TIMEOUT (3 * HZ) 167 168 /** 169 * struct rmc_entry - entry in the Recent Multicast Cache 170 * 171 * @seqnum: mesh sequence number of the frame 172 * @exp_time: expiration time of the entry, in jiffies 173 * @sa: source address of the frame 174 * @list: hashtable list pointer 175 * 176 * The Recent Multicast Cache keeps track of the latest multicast frames that 177 * have been received by a mesh interface and discards received multicast frames 178 * that are found in the cache. 179 */ 180 struct rmc_entry { 181 struct hlist_node list; 182 unsigned long exp_time; 183 u32 seqnum; 184 u8 sa[ETH_ALEN]; 185 }; 186 187 struct mesh_rmc { 188 struct hlist_head bucket[RMC_BUCKETS]; 189 u32 idx_mask; 190 }; 191 192 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ) 193 194 #define MESH_PATH_EXPIRE (600 * HZ) 195 196 /* Default maximum number of plinks per interface */ 197 #define MESH_MAX_PLINKS 256 198 199 /* Maximum number of paths per interface */ 200 #define MESH_MAX_MPATHS 1024 201 202 /* Number of frames buffered per destination for unresolved destinations */ 203 #define MESH_FRAME_QUEUE_LEN 10 204 205 /* Public interfaces */ 206 /* Various */ 207 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, 208 const u8 *da, const u8 *sa); 209 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata, 210 struct ieee80211s_hdr *meshhdr, 211 const char *addr4or5, const char *addr6); 212 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata, 213 const u8 *addr, struct ieee80211s_hdr *mesh_hdr); 214 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata, 215 struct ieee802_11_elems *ie); 216 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata, 217 struct sk_buff *skb); 218 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, 219 struct sk_buff *skb); 220 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, 221 struct sk_buff *skb); 222 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata, 223 struct sk_buff *skb); 224 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata, 225 struct sk_buff *skb); 226 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata, 227 struct sk_buff *skb); 228 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata, 229 struct sk_buff *skb); 230 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata, 231 struct sk_buff *skb); 232 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata, 233 struct sk_buff *skb, u8 ie_len); 234 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata, 235 struct sk_buff *skb); 236 int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata, 237 struct sk_buff *skb); 238 int mesh_add_eht_cap_ie(struct ieee80211_sub_if_data *sdata, 239 struct sk_buff *skb, u8 ie_len); 240 int mesh_add_eht_oper_ie(struct ieee80211_sub_if_data *sdata, 241 struct sk_buff *skb); 242 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata); 243 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata); 244 void ieee80211s_init(void); 245 void ieee80211s_update_metric(struct ieee80211_local *local, 246 struct sta_info *sta, 247 struct ieee80211_tx_status *st); 248 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata); 249 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata); 250 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata); 251 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata); 252 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh); 253 const struct ieee80211_mesh_sync_ops *ieee80211_mesh_sync_ops_get(u8 method); 254 /* wrapper for ieee80211_bss_info_change_notify() */ 255 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata, 256 u64 changed); 257 258 /* mesh power save */ 259 u64 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata); 260 u64 ieee80211_mps_set_sta_local_pm(struct sta_info *sta, 261 enum nl80211_mesh_power_mode pm); 262 void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata, 263 struct sta_info *sta, 264 struct ieee80211_hdr *hdr); 265 void ieee80211_mps_sta_status_update(struct sta_info *sta); 266 void ieee80211_mps_rx_h_sta_process(struct sta_info *sta, 267 struct ieee80211_hdr *hdr); 268 void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta, 269 bool tx, bool acked); 270 void ieee80211_mps_frame_release(struct sta_info *sta, 271 struct ieee802_11_elems *elems); 272 273 /* Mesh paths */ 274 int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata, 275 struct sk_buff *skb); 276 int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, 277 struct sk_buff *skb); 278 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata); 279 struct mesh_path *mesh_path_lookup(struct ieee80211_sub_if_data *sdata, 280 const u8 *dst); 281 struct mesh_path *mpp_path_lookup(struct ieee80211_sub_if_data *sdata, 282 const u8 *dst); 283 int mpp_path_add(struct ieee80211_sub_if_data *sdata, 284 const u8 *dst, const u8 *mpp); 285 struct mesh_path * 286 mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx); 287 struct mesh_path * 288 mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx); 289 void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop); 290 void mesh_path_expire(struct ieee80211_sub_if_data *sdata); 291 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, 292 struct ieee80211_mgmt *mgmt, size_t len); 293 struct mesh_path * 294 mesh_path_add(struct ieee80211_sub_if_data *sdata, const u8 *dst); 295 296 int mesh_path_add_gate(struct mesh_path *mpath); 297 int mesh_path_send_to_gates(struct mesh_path *mpath); 298 int mesh_gate_num(struct ieee80211_sub_if_data *sdata); 299 u32 airtime_link_metric_get(struct ieee80211_local *local, 300 struct sta_info *sta); 301 302 /* Mesh plinks */ 303 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata, 304 u8 *hw_addr, struct ieee802_11_elems *ie, 305 struct ieee80211_rx_status *rx_status); 306 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie); 307 u64 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata); 308 void mesh_plink_timer(struct timer_list *t); 309 void mesh_plink_broken(struct sta_info *sta); 310 u64 mesh_plink_deactivate(struct sta_info *sta); 311 u64 mesh_plink_open(struct sta_info *sta); 312 u64 mesh_plink_block(struct sta_info *sta); 313 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, 314 struct ieee80211_mgmt *mgmt, size_t len, 315 struct ieee80211_rx_status *rx_status); 316 void mesh_sta_cleanup(struct sta_info *sta); 317 318 /* Private interfaces */ 319 /* Mesh paths */ 320 int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata, 321 u8 ttl, const u8 *target, u32 target_sn, 322 u16 target_rcode, const u8 *ra); 323 void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta); 324 void mesh_path_flush_pending(struct mesh_path *mpath); 325 void mesh_path_tx_pending(struct mesh_path *mpath); 326 void mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata); 327 void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata); 328 int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr); 329 void mesh_path_timer(struct timer_list *t); 330 void mesh_path_flush_by_nexthop(struct sta_info *sta); 331 void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata, 332 struct sk_buff *skb); 333 void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata); 334 335 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt); 336 struct ieee80211_mesh_fast_tx * 337 mesh_fast_tx_get(struct ieee80211_sub_if_data *sdata, const u8 *addr); 338 bool ieee80211_mesh_xmit_fast(struct ieee80211_sub_if_data *sdata, 339 struct sk_buff *skb, u32 ctrl_flags); 340 void mesh_fast_tx_cache(struct ieee80211_sub_if_data *sdata, 341 struct sk_buff *skb, struct mesh_path *mpath); 342 void mesh_fast_tx_gc(struct ieee80211_sub_if_data *sdata); 343 void mesh_fast_tx_flush_addr(struct ieee80211_sub_if_data *sdata, 344 const u8 *addr); 345 void mesh_fast_tx_flush_mpath(struct mesh_path *mpath); 346 void mesh_fast_tx_flush_sta(struct ieee80211_sub_if_data *sdata, 347 struct sta_info *sta); 348 void mesh_path_refresh(struct ieee80211_sub_if_data *sdata, 349 struct mesh_path *mpath, const u8 *addr); 350 351 #ifdef CONFIG_MAC80211_MESH 352 static inline 353 u64 mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata) 354 { 355 atomic_inc(&sdata->u.mesh.estab_plinks); 356 return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON; 357 } 358 359 static inline 360 u64 mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata) 361 { 362 atomic_dec(&sdata->u.mesh.estab_plinks); 363 return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON; 364 } 365 366 static inline int mesh_plink_free_count(struct ieee80211_sub_if_data *sdata) 367 { 368 return sdata->u.mesh.mshcfg.dot11MeshMaxPeerLinks - 369 atomic_read(&sdata->u.mesh.estab_plinks); 370 } 371 372 static inline bool mesh_plink_availables(struct ieee80211_sub_if_data *sdata) 373 { 374 return (min_t(long, mesh_plink_free_count(sdata), 375 MESH_MAX_PLINKS - sdata->local->num_sta)) > 0; 376 } 377 378 static inline void mesh_path_activate(struct mesh_path *mpath) 379 { 380 mpath->flags |= MESH_PATH_ACTIVE | MESH_PATH_RESOLVED; 381 } 382 383 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata) 384 { 385 return sdata->u.mesh.mesh_pp_id == IEEE80211_PATH_PROTOCOL_HWMP; 386 } 387 388 void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata); 389 void mesh_sync_adjust_tsf(struct ieee80211_sub_if_data *sdata); 390 void ieee80211s_stop(void); 391 #else 392 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata) 393 { return false; } 394 static inline void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata) 395 {} 396 static inline void ieee80211s_stop(void) {} 397 #endif 398 399 #endif /* IEEE80211S_H */ 400