300 lines
9.0 KiB
C
300 lines
9.0 KiB
C
/****************************************************************************
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* net/ieee802154/ieee802154_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 <semaphore.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/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/wireless/ieee802154/ieee802154_mac.h>
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#include "devif/devif.h"
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#include "ieee802154/ieee802154.h"
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#ifdef CONFIG_NET_IEEE802154
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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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static struct ieee802154_conn_s
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g_ieee802154_connections[CONFIG_NET_IEEE802154_NCONNS];
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/* A list of all free packet socket connections */
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static dq_queue_t g_free_ieee802154_connections;
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/* A list of all allocated packet socket connections */
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static dq_queue_t g_active_ieee802154_connections;
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ieee802154_conn_initialize
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*
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* Description:
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* Initialize the IEEE 802.15.5 connection structure allocator. Called
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* once and only from ieee802154_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 ieee802154_conn_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_ieee802154_connections);
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dq_init(&g_active_ieee802154_connections);
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for (i = 0; i < CONFIG_NET_IEEE802154_NCONNS; 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_ieee802154_connections[i].node,
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&g_free_ieee802154_connections);
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}
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}
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/****************************************************************************
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* Name: ieee802154_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 ieee802154_conn_s *ieee802154_conn_alloc(void)
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{
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FAR struct ieee802154_conn_s *conn;
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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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net_lock();
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conn = (FAR struct ieee802154_conn_s *)
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dq_remfirst(&g_free_ieee802154_connections);
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if (conn)
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{
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/* Enqueue the connection into the active list */
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memset(conn, 0, sizeof(struct ieee802154_conn_s));
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dq_addlast(&conn->node, &g_active_ieee802154_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: ieee802154_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 ieee802154_conn_free(FAR struct ieee802154_conn_s *conn)
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{
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FAR struct ieee802154_container_s *container;
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FAR struct ieee802154_container_s *next;
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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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/* Remove the connection from the active list */
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net_lock();
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dq_rem(&conn->node, &g_active_ieee802154_connections);
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/* Check if there any any frames attached to the container */
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for (container = conn->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->ic_flink;
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container->ic_flink = NULL;
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/* Free the contained frame data (should be only one in chain) */
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if (container->ic_iob)
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{
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iob_free(container->ic_iob);
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}
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/* And free the container itself */
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ieee802154_container_free(container);
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}
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/* Free the connection */
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dq_addlast(&conn->node, &g_free_ieee802154_connections);
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net_unlock();
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}
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/****************************************************************************
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* Name: ieee802154_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 IEEE 802.15.4 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 ieee802154_conn_s *
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ieee802154_conn_active(FAR const struct ieee802154_data_ind_s *meta)
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{
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FAR struct ieee802154_conn_s *conn;
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DEBUGASSERT(meta != NULL);
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for (conn = (FAR struct ieee802154_conn_s *)g_active_ieee802154_connections.head;
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conn != NULL;
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conn = (FAR struct ieee802154_conn_s *)conn->node.flink)
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{
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/* Does the destination address match the bound address of the socket. */
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/* REVISIT: Currently and explict address must be assigned. Should we
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* support some moral equivalent to INADDR_ANY?
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*/
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if (meta->dest.mode != conn->laddr.s_mode)
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{
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continue;
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}
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if (meta->dest.mode == IEEE802154_ADDRMODE_SHORT &&
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!IEEE802154_SADDRCMP(meta->dest.saddr, conn->laddr.s_saddr))
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{
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continue;
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}
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if (meta->dest.mode == IEEE802154_ADDRMODE_EXTENDED &&
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!IEEE802154_EADDRCMP(meta->dest.saddr, conn->laddr.s_eaddr))
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{
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continue;
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}
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/* Is the socket "connected?" to a remote peer? If so, check if the
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* source address matches the connected remote adress.
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*/
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switch (conn->raddr.s_mode)
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{
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case IEEE802154_ADDRMODE_NONE:
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return conn; /* No.. accept the connection */
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case IEEE802154_ADDRMODE_SHORT:
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if (IEEE802154_SADDRCMP(meta->dest.saddr, conn->raddr.s_saddr))
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{
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return conn;
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}
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break;
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case IEEE802154_ADDRMODE_EXTENDED:
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if (IEEE802154_EADDRCMP(meta->dest.eaddr, conn->raddr.s_eaddr))
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{
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return conn;
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}
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break;
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default:
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nerr("ERROR: Invalid address mode: %u\n", conn->raddr.s_mode);
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return NULL;
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}
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}
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return conn;
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}
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/****************************************************************************
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* Name: ieee802154_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 ieee802154_conn_s *
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ieee802154_conn_next(FAR struct ieee802154_conn_s *conn)
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{
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if (!conn)
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{
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return (FAR struct ieee802154_conn_s *)
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g_active_ieee802154_connections.head;
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}
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else
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{
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return (FAR struct ieee802154_conn_s *)conn->node.flink;
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}
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}
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#endif /* CONFIG_NET_IEEE802154 */
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