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/*
* Copyright (c) 2020 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef ZEPHYR_SUBSYS_BLUETOOTH_MESH_SUBNET_H_
#define ZEPHYR_SUBSYS_BLUETOOTH_MESH_SUBNET_H_
#include <stdint.h>
#include <sys/types.h>
#include <zephyr/net/buf.h>
#include <zephyr/kernel.h>
#include <zephyr/sys/iterable_sections.h>
#define BT_MESH_NET_FLAG_KR BIT(0)
#define BT_MESH_NET_FLAG_IVU BIT(1)
#define BT_MESH_KR_NORMAL 0x00
#define BT_MESH_KR_PHASE_1 0x01
#define BT_MESH_KR_PHASE_2 0x02
#define BT_MESH_KR_PHASE_3 0x03
/** Which of the two subnet.keys should be used for sending. */
#define SUBNET_KEY_TX_IDX(sub) ((sub)->kr_phase == BT_MESH_KR_PHASE_2)
struct bt_mesh_net_rx;
enum bt_mesh_key_evt;
/** Network message encryption credentials */
struct bt_mesh_net_cred {
uint8_t nid; /* NID */
uint8_t enc[16]; /* EncKey */
uint8_t privacy[16]; /* PrivacyKey */
};
struct bt_mesh_beacon {
uint32_t sent; /* Timestamp of last sent beacon */
uint32_t recv; /* Timestamp of last received beacon */
uint8_t last; /* Number of beacons during last
* observation window
*/
uint8_t cur; /* Number of beacons observed during
* currently ongoing window.
*/
uint8_t cache[8]; /* Cached last beacon auth value */
uint8_t auth[8]; /* Beacon Authentication Value */
};
/** Subnet instance. */
struct bt_mesh_subnet {
uint16_t net_idx; /* NetKeyIndex */
uint8_t kr_phase; /* Key Refresh Phase */
uint8_t node_id; /* Node Identity State */
uint32_t node_id_start; /* Node Identity started timestamp */
struct bt_mesh_beacon secure_beacon;
#if defined(CONFIG_BT_MESH_PRIV_BEACONS)
struct bt_mesh_beacon priv_beacon;
struct {
uint16_t idx; /* Private beacon random index */
bool node_id; /* Private Node Identity enabled */
uint8_t data[5]; /* Private Beacon data */
} priv_beacon_ctx;
#endif
struct bt_mesh_subnet_keys {
bool valid;
uint8_t net[16]; /* NetKey */
struct bt_mesh_net_cred msg;
uint8_t net_id[8]; /* Network ID */
#if defined(CONFIG_BT_MESH_GATT_PROXY)
uint8_t identity[16]; /* IdentityKey */
#endif
uint8_t beacon[16]; /* BeaconKey */
#if defined(CONFIG_BT_MESH_V1d1)
uint8_t priv_beacon[16]; /* PrivateBeaconKey */
#endif
} keys[2];
#if defined(CONFIG_BT_MESH_PROXY_SOLICITATION)
bool sol_tx;
#endif
#if defined(CONFIG_BT_MESH_OD_PRIV_PROXY_SRV)
uint32_t priv_net_id_sent; /* Timestamp for Private Network ID advertising
* started via Proxy Solicitation
*/
bool solicited; /* Subnet received valid Solicitation PDU */
#endif
};
/** Subnet callback structure. Instantiate with @ref BT_MESH_SUBNET_CB */
struct bt_mesh_subnet_cb {
void (*evt_handler)(struct bt_mesh_subnet *subnet,
enum bt_mesh_key_evt evt);
};
/**
* @brief Register a subnet event callback.
*
* @param _name Handler name.
*/
#define BT_MESH_SUBNET_CB_DEFINE(_name) \
static const STRUCT_SECTION_ITERABLE( \
bt_mesh_subnet_cb, _CONCAT(bt_mesh_subnet_cb_, _name))
/** @brief Reset all Network keys. */
void bt_mesh_net_keys_reset(void);
/** @brief Call cb on every valid Subnet until it returns a non-zero value.
*
* @param cb Callback to call, or NULL to return first valid subnet. If the callback returns true,
* iteration stops, and the passed subnet is returned.
* @param cb_data Callback data to pass to callback.
*
* @return Subnet that returned non-zero value.
*/
struct bt_mesh_subnet *bt_mesh_subnet_find(bool (*cb)(struct bt_mesh_subnet *sub, void *cb_data),
void *cb_data);
/** @brief Iterate through all valid Subnets.
*
* @param cb Callback to call on every Subnet.
*
* @returns The number of valid subnets.
*/
size_t bt_mesh_subnet_foreach(void (*cb)(struct bt_mesh_subnet *sub));
/** @brief Get the next valid Subnet.
*
* If there's only one valid Subnet, this will be returned on every call.
*
* @param sub Previous Subnet, or NULL to get the first valid.
*
* @returns Gets the next valid Subnet after @c sub, or NULL if there are no
* valid Subnets.
*/
struct bt_mesh_subnet *bt_mesh_subnet_next(struct bt_mesh_subnet *sub);
/** @brief Get a pointer to the Subnet with the given index.
*
* @param net_idx Network index to look for.
*
* @returns Subnet with index @c net_idx, or NULL if no such Subnet is known.
*/
struct bt_mesh_subnet *bt_mesh_subnet_get(uint16_t net_idx);
/** @brief Initialize a new Subnet.
*
* @param net_idx Network index of the Subnet.
* @param kr_phase Key refresh phase the Subnet should be in.
* @param key The current network key for the Subnet.
* @param new_key New network key, if available.
*
* @returns 0 on success, or (negative) error code on failure.
*/
int bt_mesh_subnet_set(uint16_t net_idx, uint8_t kr_phase,
const uint8_t key[16], const uint8_t new_key[16]);
/** @brief Create Friendship credentials.
*
* @param cred Credential object to create.
* @param lpn_addr Address of the LPN node in the friendship.
* @param frnd_addr Address of the Friend node in the friendship.
* @param lpn_counter The LPN's counter parameter.
* @param frnd_counter The Friend node's counter parameter.
* @param key Network key to create the Friendship credentials for.
*
* @returns 0 on success, or (negative) error code on failure.
*/
int bt_mesh_friend_cred_create(struct bt_mesh_net_cred *cred,
uint16_t lpn_addr, uint16_t frnd_addr,
uint16_t lpn_counter, uint16_t frnd_counter,
const uint8_t key[16]);
/** @brief Iterate through all valid network credentials to decrypt a message.
*
* @param rx Network RX parameters, passed to the callback.
* @param in Input message buffer, passed to the callback.
* @param out Output message buffer, passed to the callback.
* @param cb Callback to call for each known network credential. Iteration
* stops when this callback returns @c true.
*
* @returns Whether any of the credentials got a @c true return from the
* callback.
*/
bool bt_mesh_net_cred_find(struct bt_mesh_net_rx *rx, struct net_buf_simple *in,
struct net_buf_simple *out,
bool (*cb)(struct bt_mesh_net_rx *rx,
struct net_buf_simple *in,
struct net_buf_simple *out,
const struct bt_mesh_net_cred *cred));
/** @brief Get the network flags of the given Subnet.
*
* @param sub Subnet to get the network flags of.
*
* @returns A bitmap of @ref BT_MESH_NET_FLAG_KR and @ref BT_MESH_NET_FLAG_IVU.
*/
uint8_t bt_mesh_net_flags(struct bt_mesh_subnet *sub);
/** @brief Process a Key Refresh event from a beacon.
*
* @param sub Subnet the Key Refresh was received on.
* @param kr_flag Key Refresh flag.
* @param new_key Whether the Key Refresh event was received on the new key
* set.
*
* @returns Whether the Key Refresh event caused a change.
*/
void bt_mesh_kr_update(struct bt_mesh_subnet *sub, bool kr_flag, bool new_key);
/** @brief Check whether the Subnet has the refreshed keys.
*
* @param sub Subnet.
*
* @returns Whether the Subnet's second key is valid.
*/
static inline bool
bt_mesh_subnet_has_new_key(const struct bt_mesh_subnet *sub)
{
return sub->kr_phase != BT_MESH_KR_NORMAL;
}
/** @brief Store the Subnet information in persistent storage.
*
* @param net_idx Network index to store.
*/
void bt_mesh_subnet_store(uint16_t net_idx);
/** @brief Store the pending Subnets in persistent storage. */
void bt_mesh_subnet_pending_store(void);
#endif /* ZEPHYR_SUBSYS_BLUETOOTH_MESH_SUBNET_H_ */