blob: 9fdab336fa9be4d55157bb7f6ce6a14f49f6310e [file] [log] [blame]
/** @file
* @brief Internal APIs for Bluetooth L2CAP handling.
*/
/*
* Copyright (c) 2015-2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/bluetooth/l2cap.h>
#include <zephyr/sys/iterable_sections.h>
enum l2cap_conn_list_action {
BT_L2CAP_CHAN_LOOKUP,
BT_L2CAP_CHAN_DETACH,
};
#define BT_L2CAP_CID_BR_SIG 0x0001
#define BT_L2CAP_CID_ATT 0x0004
#define BT_L2CAP_CID_LE_SIG 0x0005
#define BT_L2CAP_CID_SMP 0x0006
#define BT_L2CAP_CID_BR_SMP 0x0007
#define BT_L2CAP_PSM_RFCOMM 0x0003
struct bt_l2cap_hdr {
uint16_t len;
uint16_t cid;
} __packed;
struct bt_l2cap_sig_hdr {
uint8_t code;
uint8_t ident;
uint16_t len;
} __packed;
#define BT_L2CAP_REJ_NOT_UNDERSTOOD 0x0000
#define BT_L2CAP_REJ_MTU_EXCEEDED 0x0001
#define BT_L2CAP_REJ_INVALID_CID 0x0002
#define BT_L2CAP_CMD_REJECT 0x01
struct bt_l2cap_cmd_reject {
uint16_t reason;
uint8_t data[0];
} __packed;
struct bt_l2cap_cmd_reject_cid_data {
uint16_t scid;
uint16_t dcid;
} __packed;
#define BT_L2CAP_CONN_REQ 0x02
struct bt_l2cap_conn_req {
uint16_t psm;
uint16_t scid;
} __packed;
/* command statuses in response */
#define BT_L2CAP_CS_NO_INFO 0x0000
#define BT_L2CAP_CS_AUTHEN_PEND 0x0001
/* valid results in conn response on BR/EDR */
#define BT_L2CAP_BR_SUCCESS 0x0000
#define BT_L2CAP_BR_PENDING 0x0001
#define BT_L2CAP_BR_ERR_PSM_NOT_SUPP 0x0002
#define BT_L2CAP_BR_ERR_SEC_BLOCK 0x0003
#define BT_L2CAP_BR_ERR_NO_RESOURCES 0x0004
#define BT_L2CAP_BR_ERR_INVALID_SCID 0x0006
#define BT_L2CAP_BR_ERR_SCID_IN_USE 0x0007
#define BT_L2CAP_CONN_RSP 0x03
struct bt_l2cap_conn_rsp {
uint16_t dcid;
uint16_t scid;
uint16_t result;
uint16_t status;
} __packed;
#define BT_L2CAP_CONF_SUCCESS 0x0000
#define BT_L2CAP_CONF_UNACCEPT 0x0001
#define BT_L2CAP_CONF_REJECT 0x0002
#define BT_L2CAP_CONF_REQ 0x04
struct bt_l2cap_conf_req {
uint16_t dcid;
uint16_t flags;
uint8_t data[0];
} __packed;
#define BT_L2CAP_CONF_RSP 0x05
struct bt_l2cap_conf_rsp {
uint16_t scid;
uint16_t flags;
uint16_t result;
uint8_t data[0];
} __packed;
/* Option type used by MTU config request data */
#define BT_L2CAP_CONF_OPT_MTU 0x01
/* Options bits selecting most significant bit (hint) in type field */
#define BT_L2CAP_CONF_HINT 0x80
#define BT_L2CAP_CONF_MASK 0x7f
struct bt_l2cap_conf_opt {
uint8_t type;
uint8_t len;
uint8_t data[0];
} __packed;
#define BT_L2CAP_DISCONN_REQ 0x06
struct bt_l2cap_disconn_req {
uint16_t dcid;
uint16_t scid;
} __packed;
#define BT_L2CAP_DISCONN_RSP 0x07
struct bt_l2cap_disconn_rsp {
uint16_t dcid;
uint16_t scid;
} __packed;
#define BT_L2CAP_INFO_FEAT_MASK 0x0002
#define BT_L2CAP_INFO_FIXED_CHAN 0x0003
#define BT_L2CAP_INFO_REQ 0x0a
struct bt_l2cap_info_req {
uint16_t type;
} __packed;
/* info result */
#define BT_L2CAP_INFO_SUCCESS 0x0000
#define BT_L2CAP_INFO_NOTSUPP 0x0001
#define BT_L2CAP_INFO_RSP 0x0b
struct bt_l2cap_info_rsp {
uint16_t type;
uint16_t result;
uint8_t data[0];
} __packed;
#define BT_L2CAP_CONN_PARAM_REQ 0x12
struct bt_l2cap_conn_param_req {
uint16_t min_interval;
uint16_t max_interval;
uint16_t latency;
uint16_t timeout;
} __packed;
#define BT_L2CAP_CONN_PARAM_ACCEPTED 0x0000
#define BT_L2CAP_CONN_PARAM_REJECTED 0x0001
#define BT_L2CAP_CONN_PARAM_RSP 0x13
struct bt_l2cap_conn_param_rsp {
uint16_t result;
} __packed;
#define BT_L2CAP_LE_CONN_REQ 0x14
struct bt_l2cap_le_conn_req {
uint16_t psm;
uint16_t scid;
uint16_t mtu;
uint16_t mps;
uint16_t credits;
} __packed;
/* valid results in conn response on LE */
#define BT_L2CAP_LE_SUCCESS 0x0000
#define BT_L2CAP_LE_ERR_PSM_NOT_SUPP 0x0002
#define BT_L2CAP_LE_ERR_NO_RESOURCES 0x0004
#define BT_L2CAP_LE_ERR_AUTHENTICATION 0x0005
#define BT_L2CAP_LE_ERR_AUTHORIZATION 0x0006
#define BT_L2CAP_LE_ERR_KEY_SIZE 0x0007
#define BT_L2CAP_LE_ERR_ENCRYPTION 0x0008
#define BT_L2CAP_LE_ERR_INVALID_SCID 0x0009
#define BT_L2CAP_LE_ERR_SCID_IN_USE 0x000A
#define BT_L2CAP_LE_ERR_UNACCEPT_PARAMS 0x000B
#define BT_L2CAP_LE_ERR_INVALID_PARAMS 0x000C
#define BT_L2CAP_LE_CONN_RSP 0x15
struct bt_l2cap_le_conn_rsp {
uint16_t dcid;
uint16_t mtu;
uint16_t mps;
uint16_t credits;
uint16_t result;
} __packed;
#define BT_L2CAP_LE_CREDITS 0x16
struct bt_l2cap_le_credits {
uint16_t cid;
uint16_t credits;
} __packed;
#define BT_L2CAP_ECRED_CONN_REQ 0x17
struct bt_l2cap_ecred_conn_req {
uint16_t psm;
uint16_t mtu;
uint16_t mps;
uint16_t credits;
uint16_t scid[0];
} __packed;
#define BT_L2CAP_ECRED_CONN_RSP 0x18
struct bt_l2cap_ecred_conn_rsp {
uint16_t mtu;
uint16_t mps;
uint16_t credits;
uint16_t result;
uint16_t dcid[0];
} __packed;
#define L2CAP_ECRED_CHAN_MAX_PER_REQ 5
#define BT_L2CAP_ECRED_RECONF_REQ 0x19
struct bt_l2cap_ecred_reconf_req {
uint16_t mtu;
uint16_t mps;
uint16_t scid[0];
} __packed;
#define BT_L2CAP_RECONF_SUCCESS 0x0000
#define BT_L2CAP_RECONF_INVALID_MTU 0x0001
#define BT_L2CAP_RECONF_INVALID_MPS 0x0002
#define BT_L2CAP_RECONF_INVALID_CID 0x0003
#define BT_L2CAP_RECONF_OTHER_UNACCEPT 0x0004
#define BT_L2CAP_ECRED_RECONF_RSP 0x1a
struct bt_l2cap_ecred_reconf_rsp {
uint16_t result;
} __packed;
struct bt_l2cap_fixed_chan {
uint16_t cid;
int (*accept)(struct bt_conn *conn, struct bt_l2cap_chan **chan);
bt_l2cap_chan_destroy_t destroy;
};
#define BT_L2CAP_CHANNEL_DEFINE(_name, _cid, _accept, _destroy) \
const STRUCT_SECTION_ITERABLE(bt_l2cap_fixed_chan, _name) = { \
.cid = _cid, \
.accept = _accept, \
.destroy = _destroy, \
}
/* Need a name different than bt_l2cap_fixed_chan for a different section */
struct bt_l2cap_br_fixed_chan {
uint16_t cid;
int (*accept)(struct bt_conn *conn, struct bt_l2cap_chan **chan);
};
#define BT_L2CAP_BR_CHANNEL_DEFINE(_name, _cid, _accept) \
const STRUCT_SECTION_ITERABLE(bt_l2cap_br_fixed_chan, _name) = { \
.cid = _cid, \
.accept = _accept, \
}
#define BR_CHAN(_ch) CONTAINER_OF(_ch, struct bt_l2cap_br_chan, chan)
/* Notify L2CAP channels of a new connection */
void bt_l2cap_connected(struct bt_conn *conn);
/* Notify L2CAP channels of a disconnect event */
void bt_l2cap_disconnected(struct bt_conn *conn);
/* Add channel to the connection */
void bt_l2cap_chan_add(struct bt_conn *conn, struct bt_l2cap_chan *chan,
bt_l2cap_chan_destroy_t destroy);
/* Remove channel from the connection */
void bt_l2cap_chan_remove(struct bt_conn *conn, struct bt_l2cap_chan *chan);
/* Delete channel */
void bt_l2cap_chan_del(struct bt_l2cap_chan *chan);
const char *bt_l2cap_chan_state_str(bt_l2cap_chan_state_t state);
#if defined(CONFIG_BT_L2CAP_LOG_LEVEL_DBG)
void bt_l2cap_chan_set_state_debug(struct bt_l2cap_chan *chan,
bt_l2cap_chan_state_t state,
const char *func, int line);
#define bt_l2cap_chan_set_state(_chan, _state) \
bt_l2cap_chan_set_state_debug(_chan, _state, __func__, __LINE__)
#else
void bt_l2cap_chan_set_state(struct bt_l2cap_chan *chan,
bt_l2cap_chan_state_t state);
#endif /* CONFIG_BT_L2CAP_LOG_LEVEL_DBG */
/*
* Notify L2CAP channels of a change in encryption state passing additionally
* HCI status of performed security procedure.
*/
void bt_l2cap_security_changed(struct bt_conn *conn, uint8_t hci_status);
/* Prepare an L2CAP PDU to be sent over a connection */
struct net_buf *bt_l2cap_create_pdu_timeout(struct net_buf_pool *pool,
size_t reserve,
k_timeout_t timeout);
#define bt_l2cap_create_pdu(_pool, _reserve) \
bt_l2cap_create_pdu_timeout(_pool, _reserve, K_FOREVER)
/* Prepare a L2CAP Response PDU to be sent over a connection */
struct net_buf *bt_l2cap_create_rsp(struct net_buf *buf, size_t reserve);
/* Send L2CAP PDU over a connection
*
* Buffer ownership is transferred to stack in case of success.
*/
int bt_l2cap_send_cb(struct bt_conn *conn, uint16_t cid, struct net_buf *buf,
bt_conn_tx_cb_t cb, void *user_data);
static inline int bt_l2cap_send(struct bt_conn *conn, uint16_t cid,
struct net_buf *buf)
{
return bt_l2cap_send_cb(conn, cid, buf, NULL, NULL);
}
int bt_l2cap_chan_send_cb(struct bt_l2cap_chan *chan, struct net_buf *buf, bt_conn_tx_cb_t cb,
void *user_data);
/* Receive a new L2CAP PDU from a connection */
void bt_l2cap_recv(struct bt_conn *conn, struct net_buf *buf, bool complete);
/* Perform connection parameter update request */
int bt_l2cap_update_conn_param(struct bt_conn *conn,
const struct bt_le_conn_param *param);
/* Initialize L2CAP and supported channels */
void bt_l2cap_init(void);
/* Lookup channel by Transmission CID */
struct bt_l2cap_chan *bt_l2cap_le_lookup_tx_cid(struct bt_conn *conn,
uint16_t cid);
/* Lookup channel by Receiver CID */
struct bt_l2cap_chan *bt_l2cap_le_lookup_rx_cid(struct bt_conn *conn,
uint16_t cid);
/* Initialize BR/EDR L2CAP signal layer */
void bt_l2cap_br_init(void);
/* Register fixed channel */
void bt_l2cap_br_fixed_chan_register(struct bt_l2cap_fixed_chan *chan);
/* Notify BR/EDR L2CAP channels about established new ACL connection */
void bt_l2cap_br_connected(struct bt_conn *conn);
/* Lookup BR/EDR L2CAP channel by Receiver CID */
struct bt_l2cap_chan *bt_l2cap_br_lookup_rx_cid(struct bt_conn *conn,
uint16_t cid);
/* Disconnects dynamic channel */
int bt_l2cap_br_chan_disconnect(struct bt_l2cap_chan *chan);
/* Make connection to peer psm server */
int bt_l2cap_br_chan_connect(struct bt_conn *conn, struct bt_l2cap_chan *chan,
uint16_t psm);
/* Send packet data to connected peer */
int bt_l2cap_br_chan_send(struct bt_l2cap_chan *chan, struct net_buf *buf);
int bt_l2cap_br_chan_send_cb(struct bt_l2cap_chan *chan, struct net_buf *buf, bt_conn_tx_cb_t cb,
void *user_data);
/*
* Handle security level changed on link passing HCI status of performed
* security procedure.
*/
void l2cap_br_encrypt_change(struct bt_conn *conn, uint8_t hci_status);
/* Handle received data */
void bt_l2cap_br_recv(struct bt_conn *conn, struct net_buf *buf);
struct bt_l2cap_ecred_cb {
void (*ecred_conn_rsp)(struct bt_conn *conn, uint16_t result, uint8_t attempted,
uint8_t succeeded, uint16_t psm);
void (*ecred_conn_req)(struct bt_conn *conn, uint16_t result, uint16_t psm);
};
/* Register callbacks for Enhanced Credit based Flow Control */
void bt_l2cap_register_ecred_cb(const struct bt_l2cap_ecred_cb *cb);
/* Returns a server if it exists for given psm. */
struct bt_l2cap_server *bt_l2cap_server_lookup_psm(uint16_t psm);