288 lines
8.1 KiB
C
288 lines
8.1 KiB
C
/****************************************************************************
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* net/icmpv6/icmpv6_conn.c
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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 <arch/irq.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/mutex.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 "devif/devif.h"
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#include "icmpv6/icmpv6.h"
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#ifdef CONFIG_NET_ICMPv6_SOCKET
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* The array containing all IPPROTO_ICMP socket connections */
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#if CONFIG_NET_ICMPv6_PREALLOC_CONNS > 0
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static struct icmpv6_conn_s
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g_icmpv6_connections[CONFIG_NET_ICMPv6_PREALLOC_CONNS];
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#endif
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/* A list of all free IPPROTO_ICMP socket connections */
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static dq_queue_t g_free_icmpv6_connections;
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static mutex_t g_free_lock = NXMUTEX_INITIALIZER;
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/* A list of all allocated IPPROTO_ICMP socket connections */
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static dq_queue_t g_active_icmpv6_connections;
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: icmpv6_sock_initialize
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*
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* Description:
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* Initialize the IPPROTO_ICMP socket connection structures. Called once
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* and only from the network initialization layer.
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*
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****************************************************************************/
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void icmpv6_sock_initialize(void)
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{
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#if CONFIG_NET_ICMPv6_PREALLOC_CONNS > 0
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int i;
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for (i = 0; i < CONFIG_NET_ICMPv6_PREALLOC_CONNS; i++)
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{
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/* Move the connection structure to the free list */
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dq_addlast(&g_icmpv6_connections[i].sconn.node,
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&g_free_icmpv6_connections);
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}
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#endif
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}
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/****************************************************************************
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* Name: icmpv6_alloc
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*
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* Description:
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* Allocate a new, uninitialized IPPROTO_ICMP socket connection structure.
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* This is normally something done by the implementation of the socket()
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* interface.
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*
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****************************************************************************/
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FAR struct icmpv6_conn_s *icmpv6_alloc(void)
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{
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FAR struct icmpv6_conn_s *conn = NULL;
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int ret;
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/* The free list is protected by a mutex. */
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ret = nxmutex_lock(&g_free_lock);
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if (ret >= 0)
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{
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#if CONFIG_NET_ICMPv6_ALLOC_CONNS > 0
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if (dq_peek(&g_active_icmpv6_connections) == NULL)
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{
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#if CONFIG_NET_ICMPv6_MAX_CONNS > 0
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if (dq_count(&g_active_icmpv6_connections) +
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CONFIG_NET_ICMPv6_ALLOC_CONNS > CONFIG_NET_ICMPv6_MAX_CONNS)
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{
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nxmutex_unlock(&g_free_lock);
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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_ICMPv6_ALLOC_CONNS);
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if (conn != NULL)
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{
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for (ret = 0; ret < CONFIG_NET_ICMPv6_ALLOC_CONNS; ret++)
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{
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dq_addlast(&conn[ret].sconn.node,
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&g_free_icmpv6_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 icmpv6_conn_s *)
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dq_remfirst(&g_free_icmpv6_connections);
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if (conn != NULL)
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{
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/* Enqueue the connection into the active list */
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dq_addlast(&conn->sconn.node, &g_active_icmpv6_connections);
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}
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nxmutex_unlock(&g_free_lock);
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}
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return conn;
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}
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/****************************************************************************
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* Name: icmpv6_free
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*
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* Description:
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* Free a IPPROTO_ICMP socket connection structure that is no longer in
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* use. This should be done by the implementation of close().
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*
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****************************************************************************/
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void icmpv6_free(FAR struct icmpv6_conn_s *conn)
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{
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/* The free list is protected by a mutex. */
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DEBUGASSERT(conn->crefs == 0);
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/* Take the mutex (perhaps waiting) */
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nxmutex_lock(&g_free_lock);
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/* Remove the connection from the active list */
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dq_rem(&conn->sconn.node, &g_active_icmpv6_connections);
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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_ICMPv6_ALLOC_CONNS == 1
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if (conn < g_icmpv6_connections || conn >= (g_icmpv6_connections +
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CONFIG_NET_ICMPv6_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->sconn.node, &g_free_icmpv6_connections);
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}
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nxmutex_unlock(&g_free_lock);
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}
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/****************************************************************************
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* Name: icmpv6_active()
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*
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* Description:
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* Find a connection structure that is the appropriate connection to be
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* used with the provided ECHO request ID.
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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 icmpv6_conn_s *icmpv6_active(uint16_t id)
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{
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FAR struct icmpv6_conn_s *conn =
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(FAR struct icmpv6_conn_s *)g_active_icmpv6_connections.head;
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while (conn != NULL)
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{
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/* FIXME lmac in conn should have been set by icmpv6_bind() */
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if (id == conn->id)
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{
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/* Matching connection found.. return a reference to it */
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break;
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}
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/* Look at the next active connection */
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conn = (FAR struct icmpv6_conn_s *)conn->sconn.node.flink;
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}
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return conn;
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}
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/****************************************************************************
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* Name: icmpv6_nextconn
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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 icmpv6_conn_s *icmpv6_nextconn(FAR struct icmpv6_conn_s *conn)
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{
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if (conn == NULL)
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{
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return (FAR struct icmpv6_conn_s *)g_active_icmpv6_connections.head;
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}
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else
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{
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return (FAR struct icmpv6_conn_s *)conn->sconn.node.flink;
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}
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}
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/****************************************************************************
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* Name: icmpv6_foreach
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*
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* Description:
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* Enumerate each ICMPv6 connection structure. This function will terminate
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* when either (1) all connection have been enumerated or (2) when a
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* callback returns any non-zero value.
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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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int icmpv6_foreach(icmpv6_callback_t callback, FAR void *arg)
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{
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FAR struct icmpv6_conn_s *conn;
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int ret = 0;
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if (callback != NULL)
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{
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for (conn = icmpv6_nextconn(NULL); conn != NULL;
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conn = icmpv6_nextconn(conn))
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{
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ret = callback(conn, arg);
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if (ret != 0)
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{
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break;
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}
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}
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}
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return ret;
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}
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#endif /* CONFIG_NET_ICMP */
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