287 lines
8.3 KiB
C
287 lines
8.3 KiB
C
/****************************************************************************
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* net/icmp/icmpv6_conn.c
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*
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* Copyright (C) 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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/semaphore.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/arp.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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static struct icmpv6_conn_s g_icmpv6_connections[CONFIG_NET_ICMPv6_NCONNS];
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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 sem_t g_free_sem;
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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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int i;
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/* Initialize the queues */
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dq_init(&g_free_icmpv6_connections);
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dq_init(&g_active_icmpv6_connections);
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nxsem_init(&g_free_sem, 0, 1);
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for (i = 0; i < CONFIG_NET_ICMPv6_NCONNS; 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].node, &g_free_icmpv6_connections);
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}
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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 only accessed from user, non-interrupt level and
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* is protected by a semaphore (that behaves like a mutex).
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*/
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ret = net_lockedwait(&g_free_sem);
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if (ret >= 0)
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{
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conn = (FAR struct icmpv6_conn_s *)dq_remfirst(&g_free_icmpv6_connections);
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if (conn != NULL)
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{
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/* Clear the connection structure */
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memset(conn, 0, sizeof(struct icmpv6_conn_s));
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/* Enqueue the connection into the active list */
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dq_addlast(&conn->node, &g_active_icmpv6_connections);
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}
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nxsem_post(&g_free_sem);
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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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int ret;
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/* The free list is only accessed from user, non-interrupt level and
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* is protected by a semaphore (that behaves like a mutex).
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*/
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DEBUGASSERT(conn->crefs == 0);
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/* Take the semaphore (perhaps waiting) */
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while ((ret = net_lockedwait(&g_free_sem)) < 0)
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{
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/* The only case that an error should occur here is if
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* the wait was awakened by a signal.
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*/
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DEBUGASSERT(ret == -EINTR || ret == -ECANCELED);
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}
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UNUSED(ret);
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/* Is this the last reference on the connection? It might not be if the
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* socket was cloned.
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*/
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if (conn->crefs > 1)
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{
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/* No.. just decrement the reference count */
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conn->crefs--;
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}
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else
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{
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/* Remove the connection from the active list */
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dq_rem(&conn->node, &g_active_icmpv6_connections);
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/* Free the connection */
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dq_addlast(&conn->node, &g_free_icmpv6_connections);
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nxsem_post(&g_free_sem);
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}
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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->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->node.flink;
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}
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}
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/****************************************************************************
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* Name: icmpv6_findconn
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*
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* Description:
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* Find an ICMPv6 connection structure that is expecting a ICMPv6 ECHO response
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* with this ID from this device
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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_findconn(FAR struct net_driver_s *dev, uint8_t id)
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{
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FAR struct icmpv6_conn_s *conn;
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for (conn = icmpv6_nextconn(NULL); conn != NULL; conn = icmpv6_nextconn(conn))
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{
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if (conn->id == id && conn->dev == dev && conn->nreqs > 0)
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{
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return conn;
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}
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}
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return conn;
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}
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#endif /* CONFIG_NET_ICMP */
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