1 /* Bluetooth Mesh */
2
3 /*
4 * Copyright (c) 2017 Intel Corporation
5 * Additional Copyright (c) 2018 Espressif Systems (Shanghai) PTE LTD
6 *
7 * SPDX-License-Identifier: Apache-2.0
8 */
9
10 #ifndef _NET_H_
11 #define _NET_H_
12
13 #include "mesh_access.h"
14
15 #ifdef __cplusplus
16 extern "C" {
17 #endif
18
19 #define BLE_MESH_NET_FLAG_KR BIT(0)
20 #define BLE_MESH_NET_FLAG_IVU BIT(1)
21
22 #define BLE_MESH_KR_NORMAL 0x00
23 #define BLE_MESH_KR_PHASE_1 0x01
24 #define BLE_MESH_KR_PHASE_2 0x02
25 #define BLE_MESH_KR_PHASE_3 0x03
26
27 #define BLE_MESH_IV_UPDATE(flags) ((flags >> 1) & 0x01)
28 #define BLE_MESH_KEY_REFRESH(flags) (flags & 0x01)
29
30 /* How many hours in between updating IVU duration */
31 #define BLE_MESH_IVU_MIN_HOURS 96
32 #define BLE_MESH_IVU_HOURS (BLE_MESH_IVU_MIN_HOURS / CONFIG_BLE_MESH_IVU_DIVIDER)
33 #define BLE_MESH_IVU_TIMEOUT K_HOURS(BLE_MESH_IVU_HOURS)
34
35 struct bt_mesh_app_key {
36 uint16_t net_idx;
37 uint16_t app_idx;
38 bool updated;
39 struct bt_mesh_app_keys {
40 uint8_t id;
41 uint8_t val[16];
42 } keys[2];
43 };
44
45 struct bt_mesh_subnet {
46 uint32_t beacon_sent; /* Timestamp of last sent beacon */
47 uint8_t beacons_last; /* Number of beacons during last observation window. */
48 uint8_t beacons_cur; /* Number of beacons observed during currently ongoing window. */
49
50 uint8_t beacon_cache[21]; /* Cached last authenticated beacon */
51
52 uint16_t net_idx; /* NetKeyIndex */
53
54 bool kr_flag; /* Key Refresh Flag */
55 uint8_t kr_phase; /* Key Refresh Phase */
56
57 uint8_t node_id; /* Node Identity State */
58 uint32_t node_id_start; /* Node Identity started timestamp */
59
60 uint8_t auth[8]; /* Beacon Authentication Value */
61
62 struct bt_mesh_subnet_keys {
63 uint8_t net[16]; /* NetKey */
64 uint8_t nid; /* NID */
65 uint8_t enc[16]; /* EncKey */
66 uint8_t net_id[8]; /* Network ID */
67 #if defined(CONFIG_BLE_MESH_GATT_PROXY_SERVER)
68 uint8_t identity[16]; /* IdentityKey */
69 #endif
70 uint8_t privacy[16]; /* PrivacyKey */
71 uint8_t beacon[16]; /* BeaconKey */
72 } keys[2];
73 };
74
75 struct bt_mesh_rpl {
76 uint16_t src;
77 bool old_iv;
78 #if defined(CONFIG_BLE_MESH_SETTINGS)
79 bool store;
80 #endif
81 uint32_t seq;
82 };
83
84 #if defined(CONFIG_BLE_MESH_FRIEND)
85 #define FRIEND_SEG_RX CONFIG_BLE_MESH_FRIEND_SEG_RX
86 #define FRIEND_SUB_LIST_SIZE CONFIG_BLE_MESH_FRIEND_SUB_LIST_SIZE
87 #else
88 #define FRIEND_SEG_RX 0
89 #define FRIEND_SUB_LIST_SIZE 0
90 #endif
91
92 struct bt_mesh_friend {
93 uint16_t lpn;
94 uint8_t recv_delay;
95 uint8_t fsn:1,
96 send_last:1,
97 pending_req:1,
98 sec_update:1,
99 pending_buf:1,
100 valid:1,
101 established:1;
102 int32_t poll_to;
103 uint8_t num_elem;
104 uint16_t lpn_counter;
105 uint16_t counter;
106
107 uint16_t net_idx;
108
109 uint16_t sub_list[FRIEND_SUB_LIST_SIZE];
110
111 struct k_delayed_work timer;
112
113 struct bt_mesh_friend_seg {
114 sys_slist_t queue;
115
116 /* The target number of segments, i.e. not necessarily
117 * the current number of segments, in the queue. This is
118 * used for Friend Queue free space calculations.
119 */
120 uint8_t seg_count;
121 } seg[FRIEND_SEG_RX];
122
123 struct net_buf *last;
124
125 sys_slist_t queue;
126 uint32_t queue_size;
127
128 /* Friend Clear Procedure */
129 struct {
130 uint32_t start; /* Clear Procedure start */
131 uint16_t frnd; /* Previous Friend's address */
132 uint16_t repeat_sec; /* Repeat timeout in seconds */
133 struct k_delayed_work timer; /* Repeat timer */
134 } clear;
135 };
136
137 #if defined(CONFIG_BLE_MESH_LOW_POWER)
138 #define LPN_GROUPS CONFIG_BLE_MESH_LPN_GROUPS
139 #else
140 #define LPN_GROUPS 0
141 #endif
142
143 /* Low Power Node state */
144 struct bt_mesh_lpn {
145 enum __packed {
146 BLE_MESH_LPN_DISABLED, /* LPN feature is disabled */
147 BLE_MESH_LPN_CLEAR, /* Clear in progress */
148 BLE_MESH_LPN_TIMER, /* Waiting for auto timer expiry */
149 BLE_MESH_LPN_ENABLED, /* LPN enabled, but no Friend */
150 BLE_MESH_LPN_REQ_WAIT, /* Wait before scanning for offers */
151 BLE_MESH_LPN_WAIT_OFFER, /* Friend Req sent */
152 BLE_MESH_LPN_ESTABLISHED, /* Friendship established */
153 BLE_MESH_LPN_RECV_DELAY, /* Poll sent, waiting ReceiveDelay */
154 BLE_MESH_LPN_WAIT_UPDATE, /* Waiting for Update or message */
155 BLE_MESH_LPN_OFFER_RECV, /* Friend offer received */
156 } state;
157
158 /* Transaction Number (used for subscription list) */
159 uint8_t xact_next;
160 uint8_t xact_pending;
161 uint8_t sent_req;
162
163 /* Address of our Friend when we're a LPN. Unassigned if we don't
164 * have a friend yet.
165 */
166 uint16_t frnd;
167
168 /* Value from the friend offer */
169 uint8_t recv_win;
170
171 uint8_t req_attempts; /* Number of Request attempts */
172
173 int32_t poll_timeout;
174
175 uint8_t groups_changed: 1, /* Friend Subscription List needs updating */
176 pending_poll: 1, /* Poll to be sent after subscription */
177 disable: 1, /* Disable LPN after clearing */
178 fsn: 1, /* Friend Sequence Number */
179 established: 1, /* Friendship established */
180 clear_success: 1; /* Friend Clear Confirm received */
181
182 /* Friend Queue Size */
183 uint8_t queue_size;
184
185 /* LPNCounter */
186 uint16_t counter;
187
188 /* Previous Friend of this LPN */
189 uint16_t old_friend;
190
191 /* Duration reported for last advertising packet */
192 uint16_t adv_duration;
193
194 /* Next LPN related action timer */
195 struct k_delayed_work timer;
196
197 /* Subscribed groups */
198 uint16_t groups[LPN_GROUPS];
199
200 /* Bit fields for tracking which groups the Friend knows about */
201 BLE_MESH_ATOMIC_DEFINE(added, LPN_GROUPS);
202 BLE_MESH_ATOMIC_DEFINE(pending, LPN_GROUPS);
203 BLE_MESH_ATOMIC_DEFINE(to_remove, LPN_GROUPS);
204 };
205
206 /* bt_mesh_net.flags */
207 enum {
208 BLE_MESH_NODE, /* Device is a node */
209 BLE_MESH_PROVISIONER, /* Device is a Provisioner */
210 BLE_MESH_VALID, /* We have been provisioned */
211 BLE_MESH_VALID_PROV, /* Provisioner has been enabled */
212 BLE_MESH_SUSPENDED, /* Network is temporarily suspended */
213 BLE_MESH_IVU_IN_PROGRESS, /* IV Update in Progress */
214 BLE_MESH_IVU_INITIATOR, /* IV Update initiated by us */
215 BLE_MESH_IVU_TEST, /* IV Update test mode */
216 BLE_MESH_IVU_PENDING, /* Update blocked by SDU in progress */
217
218 /* pending storage actions, must reside within first 32 flags */
219 BLE_MESH_RPL_PENDING,
220 BLE_MESH_KEYS_PENDING,
221 BLE_MESH_NET_PENDING,
222 BLE_MESH_IV_PENDING,
223 BLE_MESH_SEQ_PENDING,
224 BLE_MESH_HB_PUB_PENDING,
225 BLE_MESH_CFG_PENDING,
226 BLE_MESH_MOD_PENDING,
227 BLE_MESH_VA_PENDING,
228
229 /* Don't touch - intentionally last */
230 BLE_MESH_FLAG_COUNT,
231 };
232
233 struct bt_mesh_net {
234 uint32_t iv_index; /* Current IV Index */
235 uint32_t seq; /* Next outgoing sequence number (24 bits) */
236
237 BLE_MESH_ATOMIC_DEFINE(flags, BLE_MESH_FLAG_COUNT);
238
239 /* Local network interface */
240 struct k_work local_work;
241 sys_slist_t local_queue;
242
243 #if defined(CONFIG_BLE_MESH_FRIEND)
244 /* Friend state, unique for each LPN that we're Friends for */
245 struct bt_mesh_friend frnd[CONFIG_BLE_MESH_FRIEND_LPN_COUNT];
246 #endif
247
248 #if defined(CONFIG_BLE_MESH_LOW_POWER)
249 struct bt_mesh_lpn lpn; /* Low Power Node state */
250 #endif
251
252 /* Number of hours in current IV Update state */
253 uint8_t ivu_duration;
254
255 /* Timer to track duration in current IV Update state */
256 struct k_delayed_work ivu_timer;
257
258 uint8_t dev_key[16];
259
260 struct bt_mesh_app_key app_keys[CONFIG_BLE_MESH_APP_KEY_COUNT];
261
262 struct bt_mesh_subnet sub[CONFIG_BLE_MESH_SUBNET_COUNT];
263
264 struct bt_mesh_rpl rpl[CONFIG_BLE_MESH_CRPL];
265
266 #if defined(CONFIG_BLE_MESH_PROVISIONER)
267 /* Application keys stored by provisioner */
268 struct bt_mesh_app_key *p_app_keys[CONFIG_BLE_MESH_PROVISIONER_APP_KEY_COUNT];
269 /* Next app_idx can be assigned */
270 uint16_t p_app_idx_next;
271
272 /* Network keys stored by provisioner */
273 struct bt_mesh_subnet *p_sub[CONFIG_BLE_MESH_PROVISIONER_SUBNET_COUNT];
274 /* Next net_idx can be assigned */
275 uint16_t p_net_idx_next;
276 #endif
277 };
278
279 /* Network interface */
280 enum bt_mesh_net_if {
281 BLE_MESH_NET_IF_ADV,
282 BLE_MESH_NET_IF_LOCAL,
283 BLE_MESH_NET_IF_PROXY,
284 BLE_MESH_NET_IF_PROXY_CFG,
285 };
286
287 /* Decoding context for Network/Transport data */
288 struct bt_mesh_net_rx {
289 struct bt_mesh_subnet *sub;
290 struct bt_mesh_msg_ctx ctx;
291 uint32_t seq; /* Sequence Number */
292 uint8_t old_iv:1, /* iv_index - 1 was used */
293 new_key:1, /* Data was encrypted with updated key */
294 friend_cred:1, /* Data was encrypted with friend cred */
295 ctl:1, /* Network Control */
296 net_if:2, /* Network interface */
297 local_match:1, /* Matched a local element */
298 friend_match:1; /* Matched an LPN we're friends for */
299 uint16_t msg_cache_idx; /* Index of entry in message cache */
300 };
301
302 /* Encoding context for Network/Transport data */
303 struct bt_mesh_net_tx {
304 struct bt_mesh_subnet *sub;
305 struct bt_mesh_msg_ctx *ctx;
306 uint16_t src;
307 uint8_t xmit;
308 uint8_t friend_cred:1,
309 aszmic:1,
310 aid: 6;
311 };
312
313 extern struct bt_mesh_net bt_mesh;
314
315 #define BLE_MESH_NET_IVI_TX (bt_mesh.iv_index - \
316 bt_mesh_atomic_test_bit(bt_mesh.flags, \
317 BLE_MESH_IVU_IN_PROGRESS))
318 #define BLE_MESH_NET_IVI_RX(rx) (bt_mesh.iv_index - (rx)->old_iv)
319
320 #define BLE_MESH_NET_HDR_LEN 9
321
322 void bt_mesh_msg_cache_clear(uint16_t unicast_addr, uint8_t elem_num);
323
324 int bt_mesh_net_keys_create(struct bt_mesh_subnet_keys *keys,
325 const uint8_t key[16]);
326
327 int bt_mesh_net_create(uint16_t idx, uint8_t flags, const uint8_t key[16],
328 uint32_t iv_index);
329
330 uint8_t bt_mesh_net_flags(struct bt_mesh_subnet *sub);
331
332 bool bt_mesh_kr_update(struct bt_mesh_subnet *sub, uint8_t new_kr, bool new_key);
333
334 void bt_mesh_net_revoke_keys(struct bt_mesh_subnet *sub);
335
336 int bt_mesh_net_beacon_update(struct bt_mesh_subnet *sub);
337
338 void bt_mesh_rpl_reset(void);
339
340 bool bt_mesh_net_iv_update(uint32_t iv_index, bool iv_update);
341
342 void bt_mesh_net_sec_update(struct bt_mesh_subnet *sub);
343
344 struct bt_mesh_subnet *bt_mesh_subnet_get(uint16_t net_idx);
345
346 struct bt_mesh_subnet *bt_mesh_subnet_find(const uint8_t net_id[8], uint8_t flags,
347 uint32_t iv_index, const uint8_t auth[8],
348 bool *new_key);
349
350 int bt_mesh_net_encode(struct bt_mesh_net_tx *tx, struct net_buf_simple *buf,
351 bool proxy);
352
353 int bt_mesh_net_send(struct bt_mesh_net_tx *tx, struct net_buf *buf,
354 const struct bt_mesh_send_cb *cb, void *cb_data);
355
356 int bt_mesh_net_resend(struct bt_mesh_subnet *sub, struct net_buf *buf,
357 bool new_key, const struct bt_mesh_send_cb *cb,
358 void *cb_data);
359
360 int bt_mesh_net_decode(struct net_buf_simple *data, enum bt_mesh_net_if net_if,
361 struct bt_mesh_net_rx *rx, struct net_buf_simple *buf);
362
363 void bt_mesh_net_recv(struct net_buf_simple *data, int8_t rssi,
364 enum bt_mesh_net_if net_if);
365
366 bool bt_mesh_primary_subnet_exist(void);
367
368 uint32_t bt_mesh_next_seq(void);
369
370 void bt_mesh_net_start(void);
371
372 void bt_mesh_net_init(void);
373 void bt_mesh_net_reset(void);
374 void bt_mesh_net_deinit(void);
375
376 void bt_mesh_net_header_parse(struct net_buf_simple *buf,
377 struct bt_mesh_net_rx *rx);
378
379 /* Friendship Credential Management */
380 struct friend_cred {
381 uint16_t net_idx;
382 uint16_t addr;
383
384 uint16_t lpn_counter;
385 uint16_t frnd_counter;
386
387 struct {
388 uint8_t nid; /* NID */
389 uint8_t enc[16]; /* EncKey */
390 uint8_t privacy[16]; /* PrivacyKey */
391 } cred[2];
392 };
393
394 int friend_cred_get(struct bt_mesh_subnet *sub, uint16_t addr, uint8_t *nid,
395 const uint8_t **enc, const uint8_t **priv);
396 int friend_cred_set(struct friend_cred *cred, uint8_t idx, const uint8_t net_key[16]);
397 void friend_cred_refresh(uint16_t net_idx);
398 int friend_cred_update(struct bt_mesh_subnet *sub);
399 struct friend_cred *friend_cred_create(struct bt_mesh_subnet *sub, uint16_t addr,
400 uint16_t lpn_counter, uint16_t frnd_counter);
401 void friend_cred_clear(struct friend_cred *cred);
402 int friend_cred_del(uint16_t net_idx, uint16_t addr);
403
send_cb_finalize(const struct bt_mesh_send_cb * cb,void * cb_data)404 static inline void send_cb_finalize(const struct bt_mesh_send_cb *cb,
405 void *cb_data)
406 {
407 if (!cb) {
408 return;
409 }
410
411 if (cb->start) {
412 cb->start(0, 0, cb_data);
413 }
414
415 if (cb->end) {
416 cb->end(0, cb_data);
417 }
418 }
419
420 #ifdef __cplusplus
421 }
422 #endif
423
424 #endif /* _NET_H_ */
425
