/****************************************************************************
* net/bluetooth/bluetooth_conn.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <netpacket/bluetooth.h>
#include <arch/irq.h>
#include <nuttx/kmalloc.h>
#include <nuttx/mm/iob.h>
#include <nuttx/net/netconfig.h>
#include <nuttx/net/net.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/bluetooth.h>
#include "devif/devif.h"
#include "bluetooth/bluetooth.h"
#ifdef CONFIG_NET_BLUETOOTH
/****************************************************************************
* Private Data
****************************************************************************/
/* The array containing all packet socket connections. Protected via the
* network lock.
*/
#ifndef CONFIG_NET_ALLOC_CONNS
static struct bluetooth_conn_s
g_bluetooth_connections[CONFIG_NET_BLUETOOTH_NCONNS];
#endif
/* A list of all free packet socket connections */
static dq_queue_t g_free_bluetooth_connections;
/* A list of all allocated packet socket connections */
static dq_queue_t g_active_bluetooth_connections;
static const bt_addr_t g_any_addr =
{
BT_ADDR_ANY
};
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: bluetooth_conn_initialize
*
* Description:
* Initialize the Bluetooth connection structure allocator. Called
* once and only from bluetooth_initialize().
*
* Assumptions:
* Called early in the initialization sequence
*
****************************************************************************/
void bluetooth_conn_initialize(void)
{
#ifndef CONFIG_NET_ALLOC_CONNS
int i;
for (i = 0; i < CONFIG_NET_BLUETOOTH_NCONNS; i++)
{
/* Link each pre-allocated connection structure into the free list. */
dq_addlast(&g_bluetooth_connections[i].bc_conn.node,
&g_free_bluetooth_connections);
}
#endif
}
/****************************************************************************
* Name: bluetooth_conn_alloc()
*
* Description:
* Allocate a new, uninitialized packet socket connection structure. This
* is normally something done by the implementation of the socket() API
*
****************************************************************************/
FAR struct bluetooth_conn_s *bluetooth_conn_alloc(void)
{
FAR struct bluetooth_conn_s *conn;
#ifdef CONFIG_NET_ALLOC_CONNS
int i;
#endif
/* The free list is protected by the network lock */
net_lock();
#ifdef CONFIG_NET_ALLOC_CONNS
if (dq_peek(&g_active_bluetooth_connections) == NULL)
{
conn = kmm_zalloc(sizeof(*conn) * CONFIG_NET_BLUETOOTH_NCONNS);
if (conn != NULL)
{
for (i = 0; i < CONFIG_NET_BLUETOOTH_NCONNS; i++)
{
dq_addlast(&conn[i].bc_conn.node,
&g_active_bluetooth_connections);
}
}
}
#endif
conn = (FAR struct bluetooth_conn_s *)
dq_remfirst(&g_free_bluetooth_connections);
if (conn)
{
/* Mark as unbound */
conn->bc_proto = BTPROTO_NONE;
/* Enqueue the connection into the active list */
dq_addlast(&conn->bc_conn.node, &g_active_bluetooth_connections);
}
net_unlock();
return conn;
}
/****************************************************************************
* Name: bluetooth_conn_free()
*
* Description:
* Free a packet socket connection structure that is no longer in use.
* This should be done by the implementation of close().
*
****************************************************************************/
void bluetooth_conn_free(FAR struct bluetooth_conn_s *conn)
{
FAR struct bluetooth_container_s *container;
FAR struct bluetooth_container_s *next;
/* The free list is protected by the network lock. */
DEBUGASSERT(conn->bc_crefs == 0);
/* Remove the connection from the active list */
net_lock();
dq_rem(&conn->bc_conn.node, &g_active_bluetooth_connections);
/* Check if there any any frames attached to the container */
for (container = conn->bc_rxhead; container != NULL; container = next)
{
/* Remove the frame from the list */
next = container->bn_flink;
container->bn_flink = NULL;
/* Free the contained frame data (should be only one in chain) */
if (container->bn_iob)
{
iob_free(container->bn_iob);
}
/* And free the container itself */
bluetooth_container_free(container);
}
/* Reset structure */
memset(conn, 0, sizeof(*conn));
/* Free the connection */
dq_addlast(&conn->bc_conn.node, &g_free_bluetooth_connections);
net_unlock();
}
/****************************************************************************
* Name: bluetooth_conn_active()
*
* Description:
* Find a connection structure that is the appropriate
* connection to be used with the provided Bluetooth header
*
* Assumptions:
* This function is called from network logic at with the network locked.
*
****************************************************************************/
FAR struct bluetooth_conn_s *
bluetooth_conn_active(FAR const struct bluetooth_frame_meta_s *meta)
{
FAR struct bluetooth_conn_s *conn;
DEBUGASSERT(meta != NULL);
for (conn =
(FAR struct bluetooth_conn_s *)g_active_bluetooth_connections.head;
conn != NULL;
conn = (FAR struct bluetooth_conn_s *)conn->bc_conn.node.flink)
{
/* match protocol and channel first */
if (meta->bm_proto != conn->bc_proto ||
meta->bm_channel != conn->bc_channel)
{
continue;
}
switch (meta->bm_proto)
{
/* For BTPROTO_HCI, the socket will not be connected but only
* bound, thus we match for the device directly
*/
case BTPROTO_HCI:
/* TODO: handle when multiple devices supported, need to add ID
* to meta and conn structures
*/
goto stop;
break;
/* For BTPROTO_L2CAP, the destination address must match the
* bound address of the socket
*/
case BTPROTO_L2CAP:
if ((BLUETOOTH_ADDRCMP(&conn->bc_raddr, &meta->bm_raddr) ||
BLUETOOTH_ADDRCMP(&conn->bc_raddr, &g_any_addr)) &&
(meta->bm_channel == conn->bc_channel))
{
goto stop;
}
break;
}
}
stop:
return conn;
}
/****************************************************************************
* Name: bluetooth_conn_next()
*
* Description:
* Traverse the list of allocated packet connections
*
* Assumptions:
* This function is called from network logic at with the network locked.
*
****************************************************************************/
FAR struct bluetooth_conn_s *
bluetooth_conn_next(FAR struct bluetooth_conn_s *conn)
{
if (!conn)
{
return (FAR struct bluetooth_conn_s *)
g_active_bluetooth_connections.head;
}
else
{
return (FAR struct bluetooth_conn_s *)conn->bc_conn.node.flink;
}
}
#endif /* CONFIG_NET_BLUETOOTH */