324 lines
8.9 KiB
C
324 lines
8.9 KiB
C
/****************************************************************************
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* net/bluetooth/bluetooth_conn.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <netpacket/bluetooth.h>
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#include <arch/irq.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/mm/iob.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/bluetooth.h>
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#include "devif/devif.h"
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#include "bluetooth/bluetooth.h"
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#ifdef CONFIG_NET_BLUETOOTH
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* The array containing all packet socket connections. Protected via the
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* network lock.
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*/
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#if CONFIG_NET_BLUETOOTH_PREALLOC_CONNS > 0
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static struct bluetooth_conn_s
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g_bluetooth_connections[CONFIG_NET_BLUETOOTH_PREALLOC_CONNS];
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#endif
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/* A list of all free packet socket connections */
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static dq_queue_t g_free_bluetooth_connections;
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/* A list of all allocated packet socket connections */
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static dq_queue_t g_active_bluetooth_connections;
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static const bt_addr_t g_any_addr =
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{
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BT_ADDR_ANY
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};
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: bluetooth_conn_initialize
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*
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* Description:
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* Initialize the Bluetooth connection structure allocator. Called
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* once and only from bluetooth_initialize().
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*
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* Assumptions:
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* Called early in the initialization sequence
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*
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****************************************************************************/
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void bluetooth_conn_initialize(void)
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{
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#if CONFIG_NET_BLUETOOTH_PREALLOC_CONNS > 0
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int i;
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for (i = 0; i < CONFIG_NET_BLUETOOTH_PREALLOC_CONNS; i++)
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{
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/* Link each pre-allocated connection structure into the free list. */
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dq_addlast(&g_bluetooth_connections[i].bc_conn.node,
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&g_free_bluetooth_connections);
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}
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#endif
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}
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/****************************************************************************
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* Name: bluetooth_conn_alloc()
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*
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* Description:
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* Allocate a new, uninitialized packet socket connection structure. This
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* is normally something done by the implementation of the socket() API
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*
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****************************************************************************/
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FAR struct bluetooth_conn_s *bluetooth_conn_alloc(void)
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{
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FAR struct bluetooth_conn_s *conn;
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#if CONFIG_NET_BLUETOOTH_ALLOC_CONNS > 0
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int i;
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#endif
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/* The free list is protected by the network lock */
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net_lock();
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#if CONFIG_NET_BLUETOOTH_ALLOC_CONNS > 0
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if (dq_peek(&g_active_bluetooth_connections) == NULL)
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{
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#if CONFIG_NET_BLUETOOTH_MAX_CONNS > 0
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if (dq_count(&g_active_bluetooth_connections) +
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CONFIG_NET_BLUETOOTH_ALLOC_CONNS > CONFIG_NET_BLUETOOTH_MAX_CONNS)
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{
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net_unlock();
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return NULL;
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}
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#endif
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conn = kmm_zalloc(sizeof(*conn) * CONFIG_NET_BLUETOOTH_ALLOC_CONNS);
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if (conn != NULL)
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{
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for (i = 0; i < CONFIG_NET_BLUETOOTH_ALLOC_CONNS; i++)
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{
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dq_addlast(&conn[i].bc_conn.node,
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&g_active_bluetooth_connections);
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}
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}
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}
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#endif
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conn = (FAR struct bluetooth_conn_s *)
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dq_remfirst(&g_free_bluetooth_connections);
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if (conn)
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{
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/* Mark as unbound */
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conn->bc_proto = BTPROTO_NONE;
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/* Enqueue the connection into the active list */
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dq_addlast(&conn->bc_conn.node, &g_active_bluetooth_connections);
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}
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net_unlock();
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return conn;
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}
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/****************************************************************************
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* Name: bluetooth_conn_free()
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*
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* Description:
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* Free a packet socket connection structure that is no longer in use.
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* This should be done by the implementation of close().
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*
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****************************************************************************/
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void bluetooth_conn_free(FAR struct bluetooth_conn_s *conn)
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{
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FAR struct bluetooth_container_s *container;
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FAR struct bluetooth_container_s *next;
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/* The free list is protected by the network lock. */
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DEBUGASSERT(conn->bc_crefs == 0);
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/* Remove the connection from the active list */
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net_lock();
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dq_rem(&conn->bc_conn.node, &g_active_bluetooth_connections);
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/* Check if there any any frames attached to the container */
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for (container = conn->bc_rxhead; container != NULL; container = next)
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{
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/* Remove the frame from the list */
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next = container->bn_flink;
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container->bn_flink = NULL;
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/* Free the contained frame data (should be only one in chain) */
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if (container->bn_iob)
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{
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iob_free(container->bn_iob);
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}
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/* And free the container itself */
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bluetooth_container_free(container);
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}
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/* If this is a preallocated or a batch allocated connection store it in
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* the free connections list. Else free it.
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*/
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#if CONFIG_NET_BLUETOOTH_ALLOC_CONNS == 1
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if (conn < g_bluetooth_connections || conn >= (g_bluetooth_connections +
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CONFIG_NET_BLUETOOTH_PREALLOC_CONNS))
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{
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kmm_free(conn);
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}
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else
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#endif
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{
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memset(conn, 0, sizeof(*conn));
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dq_addlast(&conn->bc_conn.node, &g_free_bluetooth_connections);
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}
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net_unlock();
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}
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/****************************************************************************
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* Name: bluetooth_conn_active()
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*
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* Description:
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* Find a connection structure that is the appropriate
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* connection to be used with the provided Bluetooth header
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*
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* Assumptions:
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* This function is called from network logic at with the network locked.
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*
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****************************************************************************/
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FAR struct bluetooth_conn_s *
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bluetooth_conn_active(FAR const struct bluetooth_frame_meta_s *meta)
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{
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FAR struct bluetooth_conn_s *conn;
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DEBUGASSERT(meta != NULL);
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for (conn =
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(FAR struct bluetooth_conn_s *)g_active_bluetooth_connections.head;
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conn != NULL;
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conn = (FAR struct bluetooth_conn_s *)conn->bc_conn.node.flink)
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{
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/* match protocol and channel first */
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if (meta->bm_proto != conn->bc_proto ||
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meta->bm_channel != conn->bc_channel)
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{
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continue;
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}
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switch (meta->bm_proto)
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{
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/* For BTPROTO_HCI, the socket will not be connected but only
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* bound, thus we match for the device directly
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*/
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case BTPROTO_HCI:
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/* TODO: handle when multiple devices supported, need to add ID
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* to meta and conn structures
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*/
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goto stop;
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break;
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/* For BTPROTO_L2CAP, the destination address must match the
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* bound address of the socket
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*/
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case BTPROTO_L2CAP:
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if ((BLUETOOTH_ADDRCMP(&conn->bc_raddr, &meta->bm_raddr) ||
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BLUETOOTH_ADDRCMP(&conn->bc_raddr, &g_any_addr)) &&
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(meta->bm_channel == conn->bc_channel))
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{
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goto stop;
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}
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break;
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}
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}
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stop:
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return conn;
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}
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/****************************************************************************
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* Name: bluetooth_conn_next()
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*
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* Description:
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* Traverse the list of allocated packet connections
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*
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* Assumptions:
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* This function is called from network logic at with the network locked.
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*
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****************************************************************************/
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FAR struct bluetooth_conn_s *
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bluetooth_conn_next(FAR struct bluetooth_conn_s *conn)
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{
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if (!conn)
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{
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return (FAR struct bluetooth_conn_s *)
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g_active_bluetooth_connections.head;
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}
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else
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{
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return (FAR struct bluetooth_conn_s *)conn->bc_conn.node.flink;
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}
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}
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#endif /* CONFIG_NET_BLUETOOTH */
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