260 lines
7.4 KiB
C
260 lines
7.4 KiB
C
/****************************************************************************
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* net/pkt/pkt_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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#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/kmalloc.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/ethernet.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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* Pre-processor Definitions
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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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/****************************************************************************
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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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#ifndef CONFIG_NET_ALLOC_CONNS
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static struct pkt_conn_s g_pkt_connections[CONFIG_NET_PKT_CONNS];
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#endif
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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(FAR sem_t *sem)
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{
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net_lockedwait_uninterruptible(sem);
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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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#ifndef CONFIG_NET_ALLOC_CONNS
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int i;
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#endif
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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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#ifndef CONFIG_NET_ALLOC_CONNS
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for (i = 0; i < CONFIG_NET_PKT_CONNS; i++)
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{
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dq_addlast(&g_pkt_connections[i].node, &g_free_pkt_connections);
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}
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#endif
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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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#ifdef CONFIG_NET_ALLOC_CONNS
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int i;
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#endif
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/* The free list is protected by a semaphore (that behaves like a mutex). */
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_pkt_semtake(&g_free_sem);
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#ifdef CONFIG_NET_ALLOC_CONNS
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if (dq_peek(&g_free_pkt_connections) == NULL)
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{
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conn = kmm_zalloc(sizeof(*conn) * CONFIG_NET_PKT_CONNS);
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if (conn != NULL)
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{
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for (i = 0; i < CONFIG_NET_PKT_CONNS; i++)
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{
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dq_addlast(&conn[i].node, &g_free_pkt_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 pkt_conn_s *)dq_remfirst(&g_free_pkt_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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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 protected by a semaphore (that behaves like a mutex). */
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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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/* Make sure that the connection is marked as uninitialized */
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memset(conn, 0, sizeof(*conn));
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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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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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