net/mac80211/mesh.h

   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 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata,
 222                        struct sk_buff *skb, u8 ie_len);
 223 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata,
 224                         struct sk_buff *skb);
 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 *sta,
 230                               struct ieee80211_tx_status *st);
 231 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata);
 232 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata);
 233 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata);
 234 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata);
 235 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh);
 236 const struct ieee80211_mesh_sync_ops *ieee80211_mesh_sync_ops_get(u8 method);
 237 /* wrapper for ieee80211_bss_info_change_notify() */
 238 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 239                                        u32 changed);
 240
 241 /* mesh power save */
 242 u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata);
 243 u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta,
 244                                    enum nl80211_mesh_power_mode pm);
 245 void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata,
 246                                    struct sta_info *sta,
 247                                    struct ieee80211_hdr *hdr);
 248 void ieee80211_mps_sta_status_update(struct sta_info *sta);
 249 void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
 250                                     struct ieee80211_hdr *hdr);
 251 void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta,
 252                                     bool tx, bool acked);
 253 void ieee80211_mps_frame_release(struct sta_info *sta,
 254                                  struct ieee802_11_elems *elems);
 255
 256 /* Mesh paths */
 257 int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata,
 258                         struct sk_buff *skb);
 259 int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata,
 260                          struct sk_buff *skb);
 261 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata);
 262 struct mesh_path *mesh_path_lookup(struct ieee80211_sub_if_data *sdata,
 263                                    const u8 *dst);
 264 struct mesh_path *mpp_path_lookup(struct ieee80211_sub_if_data *sdata,
 265                                   const u8 *dst);
 266 int mpp_path_add(struct ieee80211_sub_if_data *sdata,
 267                  const u8 *dst, const u8 *mpp);
 268 struct mesh_path *
 269 mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx);
 270 struct mesh_path *
 271 mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx);
 272 void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop);
 273 void mesh_path_expire(struct ieee80211_sub_if_data *sdata);
 274 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
 275                             struct ieee80211_mgmt *mgmt, size_t len);
 276 struct mesh_path *
 277 mesh_path_add(struct ieee80211_sub_if_data *sdata, const u8 *dst);
 278
 279 int mesh_path_add_gate(struct mesh_path *mpath);
 280 int mesh_path_send_to_gates(struct mesh_path *mpath);
 281 int mesh_gate_num(struct ieee80211_sub_if_data *sdata);
 282 u32 airtime_link_metric_get(struct ieee80211_local *local,
 283                             struct sta_info *sta);
 284
 285 /* Mesh plinks */
 286 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
 287                            u8 *hw_addr, struct ieee802_11_elems *ie,
 288                            struct ieee80211_rx_status *rx_status);
 289 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie);
 290 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata);
 291 void mesh_plink_timer(struct timer_list *t);
 292 void mesh_plink_broken(struct sta_info *sta);
 293 u32 mesh_plink_deactivate(struct sta_info *sta);
 294 u32 mesh_plink_open(struct sta_info *sta);
 295 u32 mesh_plink_block(struct sta_info *sta);
 296 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
 297                          struct ieee80211_mgmt *mgmt, size_t len,
 298                          struct ieee80211_rx_status *rx_status);
 299 void mesh_sta_cleanup(struct sta_info *sta);
 300
 301 /* Private interfaces */
 302 /* Mesh paths */
 303 int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata,
 304                        u8 ttl, const u8 *target, u32 target_sn,
 305                        u16 target_rcode, const u8 *ra);
 306 void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta);
 307 void mesh_path_flush_pending(struct mesh_path *mpath);
 308 void mesh_path_tx_pending(struct mesh_path *mpath);
 309 int mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata);
 310 void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata);
 311 int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr);
 312 void mesh_path_timer(struct timer_list *t);
 313 void mesh_path_flush_by_nexthop(struct sta_info *sta);
 314 void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata,
 315                              struct sk_buff *skb);
 316 void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata);
 317
 318 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt);
 319
 320 #ifdef CONFIG_MAC80211_MESH
 321 static inline
 322 u32 mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata)
 323 {
 324         atomic_inc(&sdata->u.mesh.estab_plinks);
 325         return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON;
 326 }
 327
 328 static inline
 329 u32 mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata)
 330 {
 331         atomic_dec(&sdata->u.mesh.estab_plinks);
 332         return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON;
 333 }
 334
 335 static inline int mesh_plink_free_count(struct ieee80211_sub_if_data *sdata)
 336 {
 337         return sdata->u.mesh.mshcfg.dot11MeshMaxPeerLinks -
 338                atomic_read(&sdata->u.mesh.estab_plinks);
 339 }
 340
 341 static inline bool mesh_plink_availables(struct ieee80211_sub_if_data *sdata)
 342 {
 343         return (min_t(long, mesh_plink_free_count(sdata),
 344                    MESH_MAX_PLINKS - sdata->local->num_sta)) > 0;
 345 }
 346
 347 static inline void mesh_path_activate(struct mesh_path *mpath)
 348 {
 349         mpath->flags |= MESH_PATH_ACTIVE | MESH_PATH_RESOLVED;
 350 }
 351
 352 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata)
 353 {
 354         return sdata->u.mesh.mesh_pp_id == IEEE80211_PATH_PROTOCOL_HWMP;
 355 }
 356
 357 void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata);
 358 void mesh_sync_adjust_tsf(struct ieee80211_sub_if_data *sdata);
 359 void ieee80211s_stop(void);
 360 #else
 361 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata)
 362 { return false; }
 363 static inline void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata)
 364 {}
 365 static inline void ieee80211s_stop(void) {}
 366 #endif
 367
 368 #endif /* IEEE80211S_H */