176 lines
5.1 KiB
C
176 lines
5.1 KiB
C
/****************************************************************************
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* net/net_allocroute.c
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*
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* Copyright (C) 2013 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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* 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 <stdint.h>
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#include <errno.h>
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#include <assert.h>
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#include <arch/irq.h>
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#include "net.h"
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#include "net_route.h"
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#if defined(CONFIG_NET) && defined(CONFIG_NET_ROUTE)
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* This is the routing table */
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sq_queue_t g_routes;
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* This is a list of free routing table entries */
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static sq_queue_t g_freeroutes;
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/* This is an array of pre-allocated network routes */
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static struct net_route_s g_preallocroutes[CONFIG_NET_MAXROUTES];
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: net_initroute
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*
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* Description:
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* Initialize to the routing table
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*
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* Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* Called early in initialization so that no special protection is needed.
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*
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****************************************************************************/
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void net_initroute(void)
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{
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int i;
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/* Initialize the routing table and the free list */
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sq_init(&g_routes);
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sq_init(&g_freeroutes);
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/* All all of the pre-allocated routing table entries to a free list */
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for (i = 0; i < CONFIG_NET_MAXROUTES; i++)
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{
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sq_addlast((FAR sq_entry_t *)&g_preallocroutes[i],
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(FAR sq_queue_t *)&g_freeroutes);
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}
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}
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/****************************************************************************
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* Function: net_allocroute
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*
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* Description:
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* Allocate one route by removing it from the free list
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*
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* Parameters:
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* None
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*
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* Returned Value:
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* On success, a pointer to the newly allocated route table entry is
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* returned; NULL is returned on failure.
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*
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****************************************************************************/
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FAR struct net_route_s *net_allocroute(void)
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{
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FAR struct net_route_s *route;
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uip_lock_t save;
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/* Get exclusive address to the networking data structures */
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save = uip_lock();
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/* Then add the new entry to the table */
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route = (FAR struct net_route_s *)
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sq_remfirst((FAR sq_queue_t *)&g_freeroutes);
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uip_unlock(save);
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return route;
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}
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/****************************************************************************
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* Function: net_allocroute
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*
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* Description:
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* Free one route by adding it from the free list
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*
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* Parameters:
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* route - The route to be freed
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void net_freeroute(FAR struct net_route_s *route)
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{
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uip_lock_t save;
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DEBUGASSERT(route);
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/* Get exclusive address to the networking data structures */
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save = uip_lock();
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/* Then add the new entry to the table */
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sq_addlast((FAR sq_entry_t *)route, (FAR sq_queue_t *)&g_freeroutes);
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uip_unlock(save);
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}
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#endif /* CONFIG_NET && CONFIG_NET_ROUTE */
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