/** @file
 *  @brief Internal APIs for Bluetooth connection handling.
 */

/*
 * Copyright (c) 2015 Intel Corporation
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1) Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2) Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3) Neither the name of Intel Corporation nor the names of its contributors
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

typedef enum {
	BT_CONN_DISCONNECTED,
	BT_CONN_CONNECT_SCAN,
	BT_CONN_CONNECT,
	BT_CONN_CONNECTED,
	BT_CONN_DISCONNECT,
} bt_conn_state_t;

/* L2CAP signaling channel specific context */
struct bt_conn_l2cap {
	uint8_t			ident;
};

/* bt_conn flags: the flags defined here represent connection parameters */
enum {
	BT_CONN_AUTO_CONNECT,
};

struct bt_conn {
	uint16_t		handle;
	uint8_t			role;
	atomic_t		flags[1];

	bt_addr_le_t		dst;

	bt_addr_le_t		init_addr;
	bt_addr_le_t		resp_addr;

	uint8_t			pending_pkts;

	uint8_t			encrypt;
	bt_security_t		sec_level;
	bt_security_t		required_sec_level;

	uint16_t		rx_len;
	struct bt_buf		*rx;

	/* Queue for outgoing ACL data */
	struct nano_fifo	tx_queue;

	struct bt_keys		*keys;

	/* Fixed channel contexts */
	struct bt_conn_l2cap	l2cap;
	void			*att;
	void			*smp;

	uint8_t			le_conn_interval;

	atomic_t		ref;

	bt_conn_state_t		state;

	/* Handle allowing to cancel timeout fiber */
	void			*timeout;

	uint8_t			le_features[8];

	/* Stack for TX fiber and timeout fiber.
	 * Since these fibers don't overlap, one stack can be used by
	 * both of them.
	 */
	BT_STACK(stack, 256);
};

/* Process incoming data for a connection */
void bt_conn_recv(struct bt_conn *conn, struct bt_buf *buf, uint8_t flags);

/* Send data over a connection */
void bt_conn_send(struct bt_conn *conn, struct bt_buf *buf);

/* Add a new connection */
struct bt_conn *bt_conn_add(const bt_addr_le_t *peer);

/* Look up an existing connection */
struct bt_conn *bt_conn_lookup_handle(uint16_t handle);

/* Look up a connection state. For BT_ADDR_LE_ANY, returns the first connection
 * with the specific state
 */
struct bt_conn *bt_conn_lookup_state(const bt_addr_le_t *peer,
				     const bt_conn_state_t state);

/* Set connection object in certain state and perform action related to state */
void bt_conn_set_state(struct bt_conn *conn, bt_conn_state_t state);

/* rand and ediv should be in BT order */
int bt_conn_le_start_encryption(struct bt_conn *conn, uint64_t rand,
				uint16_t ediv, const uint8_t *ltk);

int bt_conn_le_conn_update(struct bt_conn *conn, uint16_t min, uint16_t max,
			   uint16_t latency, uint16_t timeout);

/* Notify higher layers of a new connection */
void bt_conn_connected(struct bt_conn *conn);

/* Notify higher layers that RPA was resolved */
void bt_conn_identity_resolved(struct bt_conn *conn);

/* Notify higher layers that connection security changed */
void bt_conn_security_changed(struct bt_conn *conn);