140 lines
4.5 KiB
C
140 lines
4.5 KiB
C
/****************************************************************************
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* net/devif/ip_forward.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
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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 <string.h>
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#include <debug.h>
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#include <errno.h>
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#include "devif/ip_forward.h"
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#if defined(CONFIG_NET_IPFORWARD) && defined(CONFIG_NETDEV_MULTINIC)
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* This is an array of pre-allocating forwarding structures */
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static struct forward_s g_fwdpool[CONFIG_NET_IPFORWARD_NSTRUCT];
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/* This is a list of free forwarding structures */
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static FAR struct forward_s *g_fwdfree;
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ip_forward_initialize
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*
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* Description:
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* Initialize the struct forward_s allocator.
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*
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* Assumptions:
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* Called early in system initialization.
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*
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****************************************************************************/
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void ip_forward_initialize(void)
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{
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FAR struct forward_s *fwd;
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int i;
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/* Add all pre-allocated forwarding structures to the free list */
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g_fwdfree = NULL;
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for (i = 0; i < CONFIG_NET_IPFORWARD_NSTRUCT; i++)
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{
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fwd = &g_fwdpool[i];
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fwd->f_flink = g_fwdfree;
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g_fwdfree = fwd;
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}
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}
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/****************************************************************************
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* Name: ip_forward_alloc
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*
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* Description:
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* Allocate a forwarding structure by removing a pre-allocated entry from
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* a free list.
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*
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* Assumptions:
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* Caller holds the network lock. Mutually excluvive access to the free
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* list is assured by this lock.
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*
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****************************************************************************/
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FAR struct forward_s *ip_forward_alloc(void)
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{
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FAR struct forward_s *fwd;
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fwd = g_fwdfree;
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if (fwd != NULL)
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{
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g_fwdfree = fwd->f_flink;
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memset (fwd, 0, sizeof(struct forward_s));
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}
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return fwd;
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}
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/****************************************************************************
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* Name: ip_forward_free
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*
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* Description:
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* Free a forwarding structure by adding it to a free list.
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*
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* Assumptions:
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* Caller holds the network lock. Mutually excluvive access to the free
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* list is assured by this lock.
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*
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****************************************************************************/
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void ip_forward_free(FAR struct forward_s *fwd)
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{
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fwd->f_flink = g_fwdfree;
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g_fwdfree = fwd;
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}
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#endif /* CONFIG_NET_IPFORWARD && CONFIG_NETDEV_MULTINIC */
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