text: /*
   * Copyright (c) 2016, Intel Corporation
   * All rights reserved.
   * 
   * 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 the copyright holder 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.
   */
  /** @file
   *  @brief Internal APIs for Bluetooth connection handling.
   */
  
  
  #include <sys/cdefs.h>
  #include <sys/list.h>
  #include <sys/systm.h>
  #include <sys/thread.h>
  #include <sys/fifo.h>
  
  #include "mdx_support.h"
  #include <bluetooth/conn.h>
  
  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		src;
  	bt_addr_le_t		dst;
  
  	bt_addr_le_t		init_addr;	/* Initiator address. */
  	bt_addr_le_t		resp_addr;	/* Responder address. */
  
  	uint8_t			encrypt;
  
  	uint16_t		rx_len;
  	struct bt_buf		*rx;
  
  	/* Queue for outgoing ACL data */
  	struct mdx_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;
  
  	/* TX fiber stack */
  	BT_STACK(tx_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, uint8_t role);
  
  /* 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);
  