ipv6-pmtu-cache.cc

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/*
 * Copyright (c) 2013 Universita' di Firenze
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Tommaso Pecorella <tommaso.pecorella@unifi.it>
 */
 
#include "ipv6-pmtu-cache.h"
 
#include "ns3/log.h"
#include "ns3/simulator.h"
 
namespace ns3
{
 
NS_LOG_COMPONENT_DEFINE("Ipv6PmtuCache");
 
NS_OBJECT_ENSURE_REGISTERED(Ipv6PmtuCache);
 
TypeId
Ipv6PmtuCache::GetTypeId()
{
    static TypeId tid =
        TypeId("ns3::Ipv6PmtuCache")
            .SetParent<Object>()
            .SetGroupName("Internet")
            .AddAttribute(
                "CacheExpiryTime",
                "Validity time for a Path MTU entry. Default is 10 minutes, minimum is 5 minutes.",
                TimeValue(Seconds(60 * 10)),
                MakeTimeAccessor(&Ipv6PmtuCache::m_validityTime),
                MakeTimeChecker(Time(Seconds(60 * 5))));
    return tid;
}
 
Ipv6PmtuCache::Ipv6PmtuCache()
{
}
 
Ipv6PmtuCache::~Ipv6PmtuCache()
{
}
 
void
Ipv6PmtuCache::DoDispose()
{
    for (auto iter = m_pathMtuTimer.begin(); iter != m_pathMtuTimer.end(); iter++)
    {
        iter->second.Cancel();
    }
    m_pathMtuTimer.clear();
    m_pathMtu.clear();
}
 
uint32_t
Ipv6PmtuCache::GetPmtu(Ipv6Address dst)
{
    NS_LOG_FUNCTION(this << dst);
 
    if (m_pathMtu.find(dst) != m_pathMtu.end())
    {
        return m_pathMtu[dst];
    }
    return 0;
}
 
void
Ipv6PmtuCache::SetPmtu(Ipv6Address dst, uint32_t pmtu)
{
    NS_LOG_FUNCTION(this << dst << pmtu);
 
    m_pathMtu[dst] = pmtu;
    if (m_pathMtuTimer.find(dst) != m_pathMtuTimer.end())
    {
        m_pathMtuTimer[dst].Cancel();
    }
    EventId pMtuTimer;
    pMtuTimer = Simulator::Schedule(m_validityTime, &Ipv6PmtuCache::ClearPmtu, this, dst);
    m_pathMtuTimer[dst] = pMtuTimer;
}
 
Time
Ipv6PmtuCache::GetPmtuValidityTime() const
{
    NS_LOG_FUNCTION(this);
    return m_validityTime;
}
 
bool
Ipv6PmtuCache::SetPmtuValidityTime(Time validity)
{
    NS_LOG_FUNCTION(this << validity);
 
    if (validity > Seconds(60 * 5))
    {
        m_validityTime = validity;
        return true;
    }
 
    NS_LOG_LOGIC("rejecting a PMTU validity timer lesser than 5 minutes");
    return false;
}
 
void
Ipv6PmtuCache::ClearPmtu(Ipv6Address dst)
{
    NS_LOG_FUNCTION(this << dst);
 
    m_pathMtu.erase(dst);
    m_pathMtuTimer.erase(dst);
}
 
} // namespace ns3