119 lines
3.5 KiB
C
119 lines
3.5 KiB
C
/****************************************************************************
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* net/icmp/icmp_pmtu.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 <sys/time.h>
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#include <nuttx/clock.h>
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#include "icmp/icmp.h"
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#include "utils/utils.h"
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static struct icmp_pmtu_entry
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g_icmp_pmtu_entry[CONFIG_NET_ICMP_PMTU_ENTRIES];
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: icmpv4_find_pmtu_entry
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*
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* Description:
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* Search for a ipv4 destination cache entry
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*
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* Parameters:
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* destipaddr the IPv4 address of the destination
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*
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* Return:
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* not null is success; null is failure
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****************************************************************************/
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FAR struct icmp_pmtu_entry *icmpv4_find_pmtu_entry(in_addr_t destipaddr)
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{
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clock_t now = clock_systime_ticks();
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int i;
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for (i = 0; i < CONFIG_NET_ICMP_PMTU_ENTRIES; i++)
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{
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if (g_icmp_pmtu_entry[i].pmtu == 0)
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{
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continue;
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}
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if (net_ipv4addr_cmp(destipaddr, g_icmp_pmtu_entry[i].daddr))
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{
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g_icmp_pmtu_entry[i].time = now;
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return &g_icmp_pmtu_entry[i];
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}
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}
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return NULL;
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}
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/****************************************************************************
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* Name: icmpv4_add_pmtu_entry
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*
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* Description:
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* Create a new ipv4 destination cache entry. If no unused entry is found,
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* will recycle oldest entry
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*
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* Parameters:
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* destipaddr the IPv4 address of the destination
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* mtu MTU
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*
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* Return:
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* void
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****************************************************************************/
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void icmpv4_add_pmtu_entry(in_addr_t destipaddr, int mtu)
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{
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clock_t now = clock_systime_ticks();
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int j = 0;
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int i;
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for (i = 0; i < CONFIG_NET_ICMP_PMTU_ENTRIES; i++)
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{
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if ((g_icmp_pmtu_entry[i].pmtu == 0) ||
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(sclock_t)(now - g_icmp_pmtu_entry[i].time) >=
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SEC2TICK(CONFIG_NET_ICMP_PMTU_TIMEOUT * 60))
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{
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j = i;
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break;
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}
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if ((sclock_t)(g_icmp_pmtu_entry[i].time -
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g_icmp_pmtu_entry[j].time) < 0)
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{
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j = i;
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}
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}
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net_ipv4addr_copy(g_icmp_pmtu_entry[j].daddr, destipaddr);
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g_icmp_pmtu_entry[j].pmtu = mtu;
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g_icmp_pmtu_entry[j].time = now;
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}
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