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 * enum ieee80211_mesh_fast_tx_type - cached mesh fast tx entry type
139 *
140 * @MESH_FAST_TX_TYPE_LOCAL: tx from the local vif address as SA
141 * @MESH_FAST_TX_TYPE_PROXIED: local tx with a different SA (e.g. bridged)
142 * @MESH_FAST_TX_TYPE_FORWARDED: forwarded from a different mesh point
143 * @NUM_MESH_FAST_TX_TYPE: number of entry types
144 */
145 enum ieee80211_mesh_fast_tx_type {
146 MESH_FAST_TX_TYPE_LOCAL,
147 MESH_FAST_TX_TYPE_PROXIED,
148 MESH_FAST_TX_TYPE_FORWARDED,
149
150 /* must be last */
151 NUM_MESH_FAST_TX_TYPE
152 };
153
154
155 /**
156 * struct ieee80211_mesh_fast_tx_key - cached mesh fast tx entry key
157 *
158 * @addr: The Ethernet DA for this entry
159 * @type: cache entry type
160 */
161 struct ieee80211_mesh_fast_tx_key {
162 u8 addr[ETH_ALEN] __aligned(2);
163 u16 type;
164 };
165
166 /**
167 * struct ieee80211_mesh_fast_tx - cached mesh fast tx entry
168 * @rhash: rhashtable pointer
169 * @key: the lookup key for this cache entry
170 * @fast_tx: base fast_tx data
171 * @hdr: cached mesh and rfc1042 headers
172 * @hdrlen: length of mesh + rfc1042
173 * @walk_list: list containing all the fast tx entries
174 * @mpath: mesh path corresponding to the Mesh DA
175 * @mppath: MPP entry corresponding to this DA
176 * @timestamp: Last used time of this entry
177 */
178 struct ieee80211_mesh_fast_tx {
179 struct rhash_head rhash;
180 struct ieee80211_mesh_fast_tx_key key;
181
182 struct ieee80211_fast_tx fast_tx;
183 u8 hdr[sizeof(struct ieee80211s_hdr) + sizeof(rfc1042_header)];
184 u16 hdrlen;
185
186 struct mesh_path *mpath, *mppath;
187 struct hlist_node walk_list;
188 unsigned long timestamp;
189 };
190
191 /* Recent multicast cache */
192 /* RMC_BUCKETS must be a power of 2, maximum 256 */
193 #define RMC_BUCKETS 256
194 #define RMC_QUEUE_MAX_LEN 4
195 #define RMC_TIMEOUT (3 * HZ)
196
197 /**
198 * struct rmc_entry - entry in the Recent Multicast Cache
199 *
200 * @seqnum: mesh sequence number of the frame
201 * @exp_time: expiration time of the entry, in jiffies
202 * @sa: source address of the frame
203 * @list: hashtable list pointer
204 *
205 * The Recent Multicast Cache keeps track of the latest multicast frames that
206 * have been received by a mesh interface and discards received multicast frames
207 * that are found in the cache.
208 */
209 struct rmc_entry {
210 struct hlist_node list;
211 unsigned long exp_time;
212 u32 seqnum;
213 u8 sa[ETH_ALEN];
214 };
215
216 struct mesh_rmc {
217 struct hlist_head bucket[RMC_BUCKETS];
218 u32 idx_mask;
219 };
220
221 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
222
223 #define MESH_PATH_EXPIRE (600 * HZ)
224
225 /* Default maximum number of plinks per interface */
226 #define MESH_MAX_PLINKS 256
227
228 /* Maximum number of paths per interface */
229 #define MESH_MAX_MPATHS 1024
230
231 /* Number of frames buffered per destination for unresolved destinations */
232 #define MESH_FRAME_QUEUE_LEN 10
233
234 /* Public interfaces */
235 /* Various */
236 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
237 const u8 *da, const u8 *sa);
238 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
239 struct ieee80211s_hdr *meshhdr,
240 const char *addr4or5, const char *addr6);
241 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
242 const u8 *addr, struct ieee80211s_hdr *mesh_hdr);
243 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
244 struct ieee802_11_elems *ie);
245 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
246 struct sk_buff *skb);
247 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata,
248 struct sk_buff *skb);
249 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata,
250 struct sk_buff *skb);
251 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
252 struct sk_buff *skb);
253 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
254 struct sk_buff *skb);
255 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
256 struct sk_buff *skb);
257 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
258 struct sk_buff *skb);
259 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
260 struct sk_buff *skb);
261 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata,
262 struct sk_buff *skb, u8 ie_len);
263 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata,
264 struct sk_buff *skb);
265 int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata,
266 struct sk_buff *skb);
267 int mesh_add_eht_cap_ie(struct ieee80211_sub_if_data *sdata,
268 struct sk_buff *skb, u8 ie_len);
269 int mesh_add_eht_oper_ie(struct ieee80211_sub_if_data *sdata,
270 struct sk_buff *skb);
271 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata);
272 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata);
273 void ieee80211s_init(void);
274 void ieee80211s_update_metric(struct ieee80211_local *local,
275 struct sta_info *sta,
276 struct ieee80211_tx_status *st);
277 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata);
278 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata);
279 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata);
280 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata);
281 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh);
282 const struct ieee80211_mesh_sync_ops *ieee80211_mesh_sync_ops_get(u8 method);
283 /* wrapper for ieee80211_bss_info_change_notify() */
284 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
285 u64 changed);
286
287 /* mesh power save */
288 u64 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata);
289 u64 ieee80211_mps_set_sta_local_pm(struct sta_info *sta,
290 enum nl80211_mesh_power_mode pm);
291 void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata,
292 struct sta_info *sta,
293 struct ieee80211_hdr *hdr);
294 void ieee80211_mps_sta_status_update(struct sta_info *sta);
295 void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
296 struct ieee80211_hdr *hdr);
297 void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta,
298 bool tx, bool acked);
299 void ieee80211_mps_frame_release(struct sta_info *sta,
300 struct ieee802_11_elems *elems);
301
302 /* Mesh paths */
303 int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata,
304 struct sk_buff *skb);
305 int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata,
306 struct sk_buff *skb);
307 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata);
308 struct mesh_path *mesh_path_lookup(struct ieee80211_sub_if_data *sdata,
309 const u8 *dst);
310 struct mesh_path *mpp_path_lookup(struct ieee80211_sub_if_data *sdata,
311 const u8 *dst);
312 int mpp_path_add(struct ieee80211_sub_if_data *sdata,
313 const u8 *dst, const u8 *mpp);
314 struct mesh_path *
315 mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx);
316 struct mesh_path *
317 mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx);
318 void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop);
319 void mesh_path_expire(struct ieee80211_sub_if_data *sdata);
320 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
321 struct ieee80211_mgmt *mgmt, size_t len);
322 struct mesh_path *
323 mesh_path_add(struct ieee80211_sub_if_data *sdata, const u8 *dst);
324
325 int mesh_path_add_gate(struct mesh_path *mpath);
326 int mesh_path_send_to_gates(struct mesh_path *mpath);
327 int mesh_gate_num(struct ieee80211_sub_if_data *sdata);
328 u32 airtime_link_metric_get(struct ieee80211_local *local,
329 struct sta_info *sta);
330
331 /* Mesh plinks */
332 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
333 u8 *hw_addr, struct ieee802_11_elems *ie,
334 struct ieee80211_rx_status *rx_status);
335 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie);
336 u64 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata);
337 void mesh_plink_timer(struct timer_list *t);
338 void mesh_plink_broken(struct sta_info *sta);
339 u64 mesh_plink_deactivate(struct sta_info *sta);
340 u64 mesh_plink_open(struct sta_info *sta);
341 u64 mesh_plink_block(struct sta_info *sta);
342 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
343 struct ieee80211_mgmt *mgmt, size_t len,
344 struct ieee80211_rx_status *rx_status);
345 void mesh_sta_cleanup(struct sta_info *sta);
346
347 /* Private interfaces */
348 /* Mesh paths */
349 int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata,
350 u8 ttl, const u8 *target, u32 target_sn,
351 u16 target_rcode, const u8 *ra);
352 void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta);
353 void mesh_path_flush_pending(struct mesh_path *mpath);
354 void mesh_path_tx_pending(struct mesh_path *mpath);
355 void mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata);
356 void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata);
357 int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr);
358 void mesh_path_timer(struct timer_list *t);
359 void mesh_path_flush_by_nexthop(struct sta_info *sta);
360 void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata,
361 struct sk_buff *skb);
362 void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata);
363
364 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt);
365 struct ieee80211_mesh_fast_tx *
366 mesh_fast_tx_get(struct ieee80211_sub_if_data *sdata,
367 struct ieee80211_mesh_fast_tx_key *key);
368 bool ieee80211_mesh_xmit_fast(struct ieee80211_sub_if_data *sdata,
369 struct sk_buff *skb, u32 ctrl_flags);
370 void mesh_fast_tx_cache(struct ieee80211_sub_if_data *sdata,
371 struct sk_buff *skb, struct mesh_path *mpath);
372 void mesh_fast_tx_gc(struct ieee80211_sub_if_data *sdata);
373 void mesh_fast_tx_flush_addr(struct ieee80211_sub_if_data *sdata,
374 const u8 *addr);
375 void mesh_fast_tx_flush_mpath(struct mesh_path *mpath);
376 void mesh_fast_tx_flush_sta(struct ieee80211_sub_if_data *sdata,
377 struct sta_info *sta);
378 void mesh_path_refresh(struct ieee80211_sub_if_data *sdata,
379 struct mesh_path *mpath, const u8 *addr);
380
381 #ifdef CONFIG_MAC80211_MESH
382 static inline
mesh_plink_inc_estab_count(struct ieee80211_sub_if_data * sdata)383 u64 mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata)
384 {
385 atomic_inc(&sdata->u.mesh.estab_plinks);
386 return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON;
387 }
388
389 static inline
mesh_plink_dec_estab_count(struct ieee80211_sub_if_data * sdata)390 u64 mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata)
391 {
392 atomic_dec(&sdata->u.mesh.estab_plinks);
393 return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON;
394 }
395
mesh_plink_free_count(struct ieee80211_sub_if_data * sdata)396 static inline int mesh_plink_free_count(struct ieee80211_sub_if_data *sdata)
397 {
398 return sdata->u.mesh.mshcfg.dot11MeshMaxPeerLinks -
399 atomic_read(&sdata->u.mesh.estab_plinks);
400 }
401
mesh_plink_availables(struct ieee80211_sub_if_data * sdata)402 static inline bool mesh_plink_availables(struct ieee80211_sub_if_data *sdata)
403 {
404 return (min_t(long, mesh_plink_free_count(sdata),
405 MESH_MAX_PLINKS - sdata->local->num_sta)) > 0;
406 }
407
mesh_path_activate(struct mesh_path * mpath)408 static inline void mesh_path_activate(struct mesh_path *mpath)
409 {
410 mpath->flags |= MESH_PATH_ACTIVE | MESH_PATH_RESOLVED;
411 }
412
mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data * sdata)413 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata)
414 {
415 return sdata->u.mesh.mesh_pp_id == IEEE80211_PATH_PROTOCOL_HWMP;
416 }
417
418 void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata);
419 void mesh_sync_adjust_tsf(struct ieee80211_sub_if_data *sdata);
420 void ieee80211s_stop(void);
421 #else
mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data * sdata)422 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata)
423 { return false; }
mesh_path_flush_by_iface(struct ieee80211_sub_if_data * sdata)424 static inline void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata)
425 {}
ieee80211s_stop(void)426 static inline void ieee80211s_stop(void) {}
427 #endif
428
429 #endif /* IEEE80211S_H */
430