159 lines
4.6 KiB
C
159 lines
4.6 KiB
C
/****************************************************************************
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* net/ipforward/ipfwd_alloc.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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#include <string.h>
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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 <nuttx/net/tcp.h>
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#include <nuttx/net/udp.h>
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#include <nuttx/net/icmp.h>
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#include <nuttx/net/icmpv6.h>
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#include "ipforward/ipforward.h"
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#ifdef CONFIG_NET_IPFORWARD
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifdef CONFIG_NET_IPv6
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# define L2_MAXHDRLEN IPv6_HDRLEN
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#else
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# define L2_MAXHDRLEN IPv4_HDRLEN
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#endif
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#if defined(CONFIG_NET_TCP)
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# define L3_MAXHDRLEN TCP_HDRLEN /* Could be up to TCP_MAX_HDRLEN */
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#elif defined(CONFIG_NET_UDP)
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# define L3_MAXHDRLEN UDP_HDRLEN
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#elif defined(CONFIG_NET_ICMPv6)
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# define L3_MAXHDRLEN ICMPv6_HDRLEN
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#elif defined(CONFIG_NET_ICMP)
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# define L3_MAXHDRLEN ICMP_HDRLEN
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#endif
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#define MAX_HDRLEN (L2_MAXHDRLEN + L3_MAXHDRLEN)
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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: ipfwd_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 ipfwd_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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/* The IOB size must be such that the maximum L2 and L3 headers fit into
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* the contiguous memory of the first IOB in the IOB chain.
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*/
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DEBUGASSERT(MAX_HDRLEN <= CONFIG_IOB_BUFSIZE);
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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: ipfwd_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 *ipfwd_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: ipfwd_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 ipfwd_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 */
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