270 lines
8.0 KiB
C
270 lines
8.0 KiB
C
/****************************************************************************
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* net/pkt/pkt_conn.c
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*
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* Copyright (C) 2014, 2016-2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Large parts of this file were leveraged from uIP logic:
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*
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* Copyright (c) 2001-2003, Adam Dunkels.
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* All rights reserved.
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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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#if defined(CONFIG_NET) && defined(CONFIG_NET_PKT)
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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 "pkt/pkt.h"
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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 */
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static struct pkt_conn_s g_pkt_connections[CONFIG_NET_PKT_CONNS];
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/* A list of all free packet socket connections */
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static dq_queue_t g_free_pkt_connections;
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static sem_t g_free_sem;
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/* A list of all allocated packet socket connections */
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static dq_queue_t g_active_pkt_connections;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: _pkt_semtake() and _pkt_semgive()
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*
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* Description:
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* Take/give semaphore
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*
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****************************************************************************/
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static inline void _pkt_semtake(sem_t *sem)
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{
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int ret;
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/* Take the semaphore (perhaps waiting) */
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while ((ret = net_lockedwait(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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}
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#define _pkt_semgive(sem) nxsem_post(sem)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pkt_initialize()
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*
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* Description:
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* Initialize the packet socket connection structures. Called once and
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* only from the network initialization layer.
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*
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****************************************************************************/
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void pkt_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_pkt_connections);
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dq_init(&g_active_pkt_connections);
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nxsem_init(&g_free_sem, 0, 1);
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for (i = 0; i < CONFIG_NET_PKT_CONNS; i++)
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{
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/* Mark the connection closed and move it to the free list */
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g_pkt_connections[i].ifindex = 0;
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dq_addlast(&g_pkt_connections[i].node, &g_free_pkt_connections);
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}
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}
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/****************************************************************************
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* Name: pkt_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 pkt_conn_s *pkt_alloc(void)
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{
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FAR struct pkt_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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_pkt_semtake(&g_free_sem);
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conn = (FAR struct pkt_conn_s *)dq_remfirst(&g_free_pkt_connections);
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if (conn)
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{
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/* Make sure that the connection is marked as uninitialized */
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conn->ifindex = 0;
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/* Enqueue the connection into the active list */
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dq_addlast(&conn->node, &g_active_pkt_connections);
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}
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_pkt_semgive(&g_free_sem);
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return conn;
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}
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/****************************************************************************
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* Name: pkt_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 pkt_free(FAR struct pkt_conn_s *conn)
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{
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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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_pkt_semtake(&g_free_sem);
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/* Remove the connection from the active list */
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dq_rem(&conn->node, &g_active_pkt_connections);
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/* Free the connection */
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dq_addlast(&conn->node, &g_free_pkt_connections);
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_pkt_semgive(&g_free_sem);
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}
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/****************************************************************************
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* Name: pkt_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 Ethernet 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 pkt_conn_s *pkt_active(FAR struct eth_hdr_s *buf)
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{
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#define eth_addr_cmp(addr1, addr2) \
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((addr1[0] == addr2[0]) && (addr1[1] == addr2[1]) && \
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(addr1[2] == addr2[2]) && (addr1[3] == addr2[3]) && \
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(addr1[4] == addr2[4]) && (addr1[5] == addr2[5]))
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FAR struct pkt_conn_s *conn =
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(FAR struct pkt_conn_s *)g_active_pkt_connections.head;
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while (conn)
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{
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/* FIXME lmac in conn should have been set by pkt_bind() */
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if (eth_addr_cmp(buf->dest, conn->lmac))
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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 pkt_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: pkt_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 pkt_conn_s *pkt_nextconn(FAR struct pkt_conn_s *conn)
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{
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if (!conn)
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{
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return (FAR struct pkt_conn_s *)g_active_pkt_connections.head;
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}
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else
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{
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return (FAR struct pkt_conn_s *)conn->node.flink;
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}
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}
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#endif /* CONFIG_NET && CONFIG_NET_PKT */
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