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- /****************************************************************************
- * net/icmp/icmp_conn.c
- *
- * Copyright (C) 2017 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * 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. The name of the author may not be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <string.h>
- #include <assert.h>
- #include <errno.h>
- #include <debug.h>
- #include <arch/irq.h>
- #include <nuttx/semaphore.h>
- #include <nuttx/net/netconfig.h>
- #include <nuttx/net/net.h>
- #include <nuttx/net/netdev.h>
- #include "devif/devif.h"
- #include "icmp/icmp.h"
- #ifdef CONFIG_NET_ICMP_SOCKET
- /****************************************************************************
- * Private Data
- ****************************************************************************/
- /* The array containing all IPPROTO_ICMP socket connections */
- static struct icmp_conn_s g_icmp_connections[CONFIG_NET_ICMP_NCONNS];
- /* A list of all free IPPROTO_ICMP socket connections */
- static dq_queue_t g_free_icmp_connections;
- static sem_t g_free_sem;
- /* A list of all allocated IPPROTO_ICMP socket connections */
- static dq_queue_t g_active_icmp_connections;
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: icmp_sock_initialize
- *
- * Description:
- * Initialize the IPPROTO_ICMP socket connection structures. Called once
- * and only from the network initialization layer.
- *
- ****************************************************************************/
- void icmp_sock_initialize(void)
- {
- int i;
- /* Initialize the queues */
- dq_init(&g_free_icmp_connections);
- dq_init(&g_active_icmp_connections);
- nxsem_init(&g_free_sem, 0, 1);
- for (i = 0; i < CONFIG_NET_ICMP_NCONNS; i++)
- {
- /* Move the connection structure to the free list */
- dq_addlast(&g_icmp_connections[i].node, &g_free_icmp_connections);
- }
- }
- /****************************************************************************
- * Name: icmp_alloc
- *
- * Description:
- * Allocate a new, uninitialized IPPROTO_ICMP socket connection structure.
- * This is normally something done by the implementation of the socket()
- * interface.
- *
- ****************************************************************************/
- FAR struct icmp_conn_s *icmp_alloc(void)
- {
- FAR struct icmp_conn_s *conn = NULL;
- int ret;
- /* The free list is protected by a semaphore (that behaves like a mutex). */
- ret = net_lockedwait(&g_free_sem);
- if (ret >= 0)
- {
- conn = (FAR struct icmp_conn_s *)dq_remfirst(&g_free_icmp_connections);
- if (conn != NULL)
- {
- /* Clear the connection structure */
- memset(conn, 0, sizeof(struct icmp_conn_s));
- /* Enqueue the connection into the active list */
- dq_addlast(&conn->node, &g_active_icmp_connections);
- }
- nxsem_post(&g_free_sem);
- }
- return conn;
- }
- /****************************************************************************
- * Name: icmp_free
- *
- * Description:
- * Free a IPPROTO_ICMP socket connection structure that is no longer in
- * use. This should be done by the implementation of close().
- *
- ****************************************************************************/
- void icmp_free(FAR struct icmp_conn_s *conn)
- {
- int ret;
- /* The free list is protected by a semaphore (that behaves like a mutex). */
- DEBUGASSERT(conn->crefs == 0);
- /* Take the semaphore (perhaps waiting) */
- while ((ret = net_lockedwait(&g_free_sem)) < 0)
- {
- /* The only case that an error should occur here is if
- * the wait was awakened by a signal.
- */
- DEBUGASSERT(ret == -EINTR || ret == -ECANCELED);
- }
- UNUSED(ret);
- /* Is this the last reference on the connection? It might not be if the
- * socket was cloned.
- */
- if (conn->crefs > 1)
- {
- /* No.. just decrement the reference count */
- conn->crefs--;
- }
- else
- {
- /* Remove the connection from the active list */
- dq_rem(&conn->node, &g_active_icmp_connections);
- /* Free the connection */
- dq_addlast(&conn->node, &g_free_icmp_connections);
- nxsem_post(&g_free_sem);
- }
- }
- /****************************************************************************
- * Name: icmp_active()
- *
- * Description:
- * Find a connection structure that is the appropriate connection to be
- * used with the provided ECHO request ID.
- *
- * Assumptions:
- * This function is called from network logic at with the network locked.
- *
- ****************************************************************************/
- FAR struct icmp_conn_s *icmp_active(uint16_t id)
- {
- FAR struct icmp_conn_s *conn =
- (FAR struct icmp_conn_s *)g_active_icmp_connections.head;
- while (conn != NULL)
- {
- /* FIXME lmac in conn should have been set by icmp_bind() */
- if (id == conn->id)
- {
- /* Matching connection found.. return a reference to it */
- break;
- }
- /* Look at the next active connection */
- conn = (FAR struct icmp_conn_s *)conn->node.flink;
- }
- return conn;
- }
- /****************************************************************************
- * Name: icmp_nextconn
- *
- * Description:
- * Traverse the list of allocated packet connections
- *
- * Assumptions:
- * This function is called from network logic at with the network locked.
- *
- ****************************************************************************/
- FAR struct icmp_conn_s *icmp_nextconn(FAR struct icmp_conn_s *conn)
- {
- if (conn == NULL)
- {
- return (FAR struct icmp_conn_s *)g_active_icmp_connections.head;
- }
- else
- {
- return (FAR struct icmp_conn_s *)conn->node.flink;
- }
- }
- /****************************************************************************
- * Name: icmp_findconn
- *
- * Description:
- * Find an ICMP connection structure that is expecting a ICMP ECHO response
- * with this ID from this device
- *
- * Assumptions:
- * This function is called from network logic at with the network locked.
- *
- ****************************************************************************/
- FAR struct icmp_conn_s *icmp_findconn(FAR struct net_driver_s *dev,
- uint16_t id)
- {
- FAR struct icmp_conn_s *conn;
- for (conn = icmp_nextconn(NULL); conn != NULL; conn = icmp_nextconn(conn))
- {
- if (conn->id == id && conn->dev == dev && conn->nreqs > 0)
- {
- return conn;
- }
- }
- return conn;
- }
- #endif /* CONFIG_NET_ICMP */
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