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/****************************************************************************
* net/net_allocroute.c
*
* Copyright (C) 2013 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. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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
* COPYRIGHT OWNER OR CONTRIBUTORS 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 <stdint.h>
#include <errno.h>
#include <assert.h>
#include <arch/irq.h>
#include "net_internal.h"
#include "net_route.h"
#if defined(CONFIG_NET) && defined(CONFIG_NET_ROUTE)
/****************************************************************************
* Public Data
****************************************************************************/
/* This is the routing table */
sq_queue_t g_routes;
/****************************************************************************
* Private Data
****************************************************************************/
/* This is a list of free routing table entries */
static sq_queue_t g_freeroutes;
/* This is an array of pre-allocated network routes */
static struct net_route_s g_preallocroutes[CONFIG_NET_MAXROUTES];
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: net_initroute
*
* Description:
* Initialize to the routing table
*
* Parameters:
* None
*
* Returned Value:
* None
*
* Assumptions:
* Called early in initialization so that no special protection is needed.
*
****************************************************************************/
void net_initroute(void)
{
int i;
/* Initialize the routing table and the free list */
sq_init(&g_routes);
sq_init(&g_freeroutes);
/* All all of the pre-allocated routing table entries to a free list */
for (i = 0; i < CONFIG_NET_MAXROUTES; i++)
{
sq_addlast((FAR sq_entry_t *)&g_preallocroutes[i],
(FAR sq_queue_t *)&g_freeroutes);
}
}
/****************************************************************************
* Function: net_allocroute
*
* Description:
* Allocate one route by removing it from the free list
*
* Parameters:
* None
*
* Returned Value:
* On success, a pointer to the newly allocated route table entry is
* returned; NULL is returned on failure.
*
****************************************************************************/
FAR struct net_route_s *net_allocroute(void)
{
FAR struct net_route_s *route;
uip_lock_t save;
/* Get exclusive address to the networking data structures */
save = uip_lock();
/* Then add the new entry to the table */
route = (FAR struct net_route_s *)
sq_remfirst((FAR sq_queue_t *)&g_freeroutes);
uip_unlock(save);
return route;
}
/****************************************************************************
* Function: net_allocroute
*
* Description:
* Free one route by adding it from the free list
*
* Parameters:
* route - The route to be freed
*
* Returned Value:
* None
*
****************************************************************************/
void net_freeroute(FAR struct net_route_s *route)
{
uip_lock_t save;
DEBUGASSERT(route);
/* Get exclusive address to the networking data structures */
save = uip_lock();
/* Then add the new entry to the table */
sq_addlast((FAR sq_entry_t *)route, (FAR sq_queue_t *)&g_freeroutes);
uip_unlock(save);
}
#endif /* CONFIG_NET && CONFIG_NET_ROUTE */
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