1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (c) 2008, 2009 open80211s Ltd.
4 * Copyright (C) 2023 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 *
98 *
99 * The dst address is unique in the mesh path table. Since the mesh_path is
100 * protected by RCU, deleting the next_hop STA must remove / substitute the
101 * mesh_path structure and wait until that is no longer reachable before
102 * destroying the STA completely.
103 */
104 struct mesh_path {
105 u8 dst[ETH_ALEN];
106 u8 mpp[ETH_ALEN]; /* used for MPP or MAP */
107 struct rhash_head rhash;
108 struct hlist_node walk_list;
109 struct hlist_node gate_list;
110 struct ieee80211_sub_if_data *sdata;
111 struct sta_info __rcu *next_hop;
112 struct timer_list timer;
113 struct sk_buff_head frame_queue;
114 struct rcu_head rcu;
115 u32 sn;
116 u32 metric;
117 u8 hop_count;
118 unsigned long exp_time;
119 u32 discovery_timeout;
120 u8 discovery_retries;
121 enum mesh_path_flags flags;
122 spinlock_t state_lock;
123 u8 rann_snd_addr[ETH_ALEN];
124 u32 rann_metric;
125 unsigned long last_preq_to_root;
126 unsigned long fast_tx_check;
127 bool is_root;
128 bool is_gate;
129 u32 path_change_count;
130 };
131
132 #define MESH_FAST_TX_CACHE_MAX_SIZE 512
133 #define MESH_FAST_TX_CACHE_THRESHOLD_SIZE 384
134 #define MESH_FAST_TX_CACHE_TIMEOUT 8000 /* msecs */
135
136 /**
137 * struct ieee80211_mesh_fast_tx - cached mesh fast tx entry
138 * @rhash: rhashtable pointer
139 * @addr_key: The Ethernet DA which is the key for this entry
140 * @fast_tx: base fast_tx data
141 * @hdr: cached mesh and rfc1042 headers
142 * @hdrlen: length of mesh + rfc1042
143 * @walk_list: list containing all the fast tx entries
144 * @mpath: mesh path corresponding to the Mesh DA
145 * @mppath: MPP entry corresponding to this DA
146 * @timestamp: Last used time of this entry
147 */
148 struct ieee80211_mesh_fast_tx {
149 struct rhash_head rhash;
150 u8 addr_key[ETH_ALEN] __aligned(2);
151
152 struct ieee80211_fast_tx fast_tx;
153 u8 hdr[sizeof(struct ieee80211s_hdr) + sizeof(rfc1042_header)];
154 u16 hdrlen;
155
156 struct mesh_path *mpath, *mppath;
157 struct hlist_node walk_list;
158 unsigned long timestamp;
159 };
160
161 /* Recent multicast cache */
162 /* RMC_BUCKETS must be a power of 2, maximum 256 */
163 #define RMC_BUCKETS 256
164 #define RMC_QUEUE_MAX_LEN 4
165 #define RMC_TIMEOUT (3 * HZ)
166
167 /**
168 * struct rmc_entry - entry in the Recent Multicast Cache
169 *
170 * @seqnum: mesh sequence number of the frame
171 * @exp_time: expiration time of the entry, in jiffies
172 * @sa: source address of the frame
173 * @list: hashtable list pointer
174 *
175 * The Recent Multicast Cache keeps track of the latest multicast frames that
176 * have been received by a mesh interface and discards received multicast frames
177 * that are found in the cache.
178 */
179 struct rmc_entry {
180 struct hlist_node list;
181 unsigned long exp_time;
182 u32 seqnum;
183 u8 sa[ETH_ALEN];
184 };
185
186 struct mesh_rmc {
187 struct hlist_head bucket[RMC_BUCKETS];
188 u32 idx_mask;
189 };
190
191 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
192
193 #define MESH_PATH_EXPIRE (600 * HZ)
194
195 /* Default maximum number of plinks per interface */
196 #define MESH_MAX_PLINKS 256
197
198 /* Maximum number of paths per interface */
199 #define MESH_MAX_MPATHS 1024
200
201 /* Number of frames buffered per destination for unresolved destinations */
202 #define MESH_FRAME_QUEUE_LEN 10
203
204 /* Public interfaces */
205 /* Various */
206 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
207 const u8 *da, const u8 *sa);
208 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
209 struct ieee80211s_hdr *meshhdr,
210 const char *addr4or5, const char *addr6);
211 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
212 const u8 *addr, struct ieee80211s_hdr *mesh_hdr);
213 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
214 struct ieee802_11_elems *ie);
215 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
216 struct sk_buff *skb);
217 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata,
218 struct sk_buff *skb);
219 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata,
220 struct sk_buff *skb);
221 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
222 struct sk_buff *skb);
223 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
224 struct sk_buff *skb);
225 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
226 struct sk_buff *skb);
227 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
228 struct sk_buff *skb);
229 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
230 struct sk_buff *skb);
231 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata,
232 struct sk_buff *skb, u8 ie_len);
233 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata,
234 struct sk_buff *skb);
235 int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata,
236 struct sk_buff *skb);
237 int mesh_add_eht_cap_ie(struct ieee80211_sub_if_data *sdata,
238 struct sk_buff *skb, u8 ie_len);
239 int mesh_add_eht_oper_ie(struct ieee80211_sub_if_data *sdata,
240 struct sk_buff *skb);
241 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata);
242 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata);
243 void ieee80211s_init(void);
244 void ieee80211s_update_metric(struct ieee80211_local *local,
245 struct sta_info *sta,
246 struct ieee80211_tx_status *st);
247 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata);
248 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata);
249 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata);
250 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata);
251 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh);
252 const struct ieee80211_mesh_sync_ops *ieee80211_mesh_sync_ops_get(u8 method);
253 /* wrapper for ieee80211_bss_info_change_notify() */
254 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
255 u64 changed);
256
257 /* mesh power save */
258 u64 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata);
259 u64 ieee80211_mps_set_sta_local_pm(struct sta_info *sta,
260 enum nl80211_mesh_power_mode pm);
261 void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata,
262 struct sta_info *sta,
263 struct ieee80211_hdr *hdr);
264 void ieee80211_mps_sta_status_update(struct sta_info *sta);
265 void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
266 struct ieee80211_hdr *hdr);
267 void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta,
268 bool tx, bool acked);
269 void ieee80211_mps_frame_release(struct sta_info *sta,
270 struct ieee802_11_elems *elems);
271
272 /* Mesh paths */
273 int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata,
274 struct sk_buff *skb);
275 int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata,
276 struct sk_buff *skb);
277 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata);
278 struct mesh_path *mesh_path_lookup(struct ieee80211_sub_if_data *sdata,
279 const u8 *dst);
280 struct mesh_path *mpp_path_lookup(struct ieee80211_sub_if_data *sdata,
281 const u8 *dst);
282 int mpp_path_add(struct ieee80211_sub_if_data *sdata,
283 const u8 *dst, const u8 *mpp);
284 struct mesh_path *
285 mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx);
286 struct mesh_path *
287 mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx);
288 void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop);
289 void mesh_path_expire(struct ieee80211_sub_if_data *sdata);
290 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
291 struct ieee80211_mgmt *mgmt, size_t len);
292 struct mesh_path *
293 mesh_path_add(struct ieee80211_sub_if_data *sdata, const u8 *dst);
294
295 int mesh_path_add_gate(struct mesh_path *mpath);
296 int mesh_path_send_to_gates(struct mesh_path *mpath);
297 int mesh_gate_num(struct ieee80211_sub_if_data *sdata);
298 u32 airtime_link_metric_get(struct ieee80211_local *local,
299 struct sta_info *sta);
300
301 /* Mesh plinks */
302 void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
303 u8 *hw_addr, struct ieee802_11_elems *ie,
304 struct ieee80211_rx_status *rx_status);
305 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie);
306 u64 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata);
307 void mesh_plink_timer(struct timer_list *t);
308 void mesh_plink_broken(struct sta_info *sta);
309 u64 mesh_plink_deactivate(struct sta_info *sta);
310 u64 mesh_plink_open(struct sta_info *sta);
311 u64 mesh_plink_block(struct sta_info *sta);
312 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
313 struct ieee80211_mgmt *mgmt, size_t len,
314 struct ieee80211_rx_status *rx_status);
315 void mesh_sta_cleanup(struct sta_info *sta);
316
317 /* Private interfaces */
318 /* Mesh paths */
319 int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata,
320 u8 ttl, const u8 *target, u32 target_sn,
321 u16 target_rcode, const u8 *ra);
322 void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta);
323 void mesh_path_flush_pending(struct mesh_path *mpath);
324 void mesh_path_tx_pending(struct mesh_path *mpath);
325 void mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata);
326 void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata);
327 int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr);
328 void mesh_path_timer(struct timer_list *t);
329 void mesh_path_flush_by_nexthop(struct sta_info *sta);
330 void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata,
331 struct sk_buff *skb);
332 void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata);
333
334 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt);
335 struct ieee80211_mesh_fast_tx *
336 mesh_fast_tx_get(struct ieee80211_sub_if_data *sdata, const u8 *addr);
337 bool ieee80211_mesh_xmit_fast(struct ieee80211_sub_if_data *sdata,
338 struct sk_buff *skb, u32 ctrl_flags);
339 void mesh_fast_tx_cache(struct ieee80211_sub_if_data *sdata,
340 struct sk_buff *skb, struct mesh_path *mpath);
341 void mesh_fast_tx_gc(struct ieee80211_sub_if_data *sdata);
342 void mesh_fast_tx_flush_addr(struct ieee80211_sub_if_data *sdata,
343 const u8 *addr);
344 void mesh_fast_tx_flush_mpath(struct mesh_path *mpath);
345 void mesh_fast_tx_flush_sta(struct ieee80211_sub_if_data *sdata,
346 struct sta_info *sta);
347 void mesh_path_refresh(struct ieee80211_sub_if_data *sdata,
348 struct mesh_path *mpath, const u8 *addr);
349
350 #ifdef CONFIG_MAC80211_MESH
351 static inline
mesh_plink_inc_estab_count(struct ieee80211_sub_if_data * sdata)352 u64 mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata)
353 {
354 atomic_inc(&sdata->u.mesh.estab_plinks);
355 return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON;
356 }
357
358 static inline
mesh_plink_dec_estab_count(struct ieee80211_sub_if_data * sdata)359 u64 mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata)
360 {
361 atomic_dec(&sdata->u.mesh.estab_plinks);
362 return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON;
363 }
364
mesh_plink_free_count(struct ieee80211_sub_if_data * sdata)365 static inline int mesh_plink_free_count(struct ieee80211_sub_if_data *sdata)
366 {
367 return sdata->u.mesh.mshcfg.dot11MeshMaxPeerLinks -
368 atomic_read(&sdata->u.mesh.estab_plinks);
369 }
370
mesh_plink_availables(struct ieee80211_sub_if_data * sdata)371 static inline bool mesh_plink_availables(struct ieee80211_sub_if_data *sdata)
372 {
373 return (min_t(long, mesh_plink_free_count(sdata),
374 MESH_MAX_PLINKS - sdata->local->num_sta)) > 0;
375 }
376
mesh_path_activate(struct mesh_path * mpath)377 static inline void mesh_path_activate(struct mesh_path *mpath)
378 {
379 mpath->flags |= MESH_PATH_ACTIVE | MESH_PATH_RESOLVED;
380 }
381
mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data * sdata)382 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata)
383 {
384 return sdata->u.mesh.mesh_pp_id == IEEE80211_PATH_PROTOCOL_HWMP;
385 }
386
387 void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata);
388 void mesh_sync_adjust_tsf(struct ieee80211_sub_if_data *sdata);
389 void ieee80211s_stop(void);
390 #else
mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data * sdata)391 static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata)
392 { return false; }
mesh_path_flush_by_iface(struct ieee80211_sub_if_data * sdata)393 static inline void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata)
394 {}
ieee80211s_stop(void)395 static inline void ieee80211s_stop(void) {}
396 #endif
397
398 #endif /* IEEE80211S_H */
399