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set MTU if local address is specified explicitly. update MTU for ipv6 if not set

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orignal 2022-07-24 15:24:01 -04:00
parent 09aa96e486
commit dbb9295063
3 changed files with 72 additions and 18 deletions
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76
libi2pd/RouterContext.cpp
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@ -420,27 +420,30 @@ namespace i2p
if (address->host != host && address->IsCompatible (host) &&
!i2p::util::net::IsYggdrasilAddress (address->host))
{
// update host
address->host = host;
if (host.is_v6 () && (address->transportStyle == i2p::data::RouterInfo::eTransportSSU || address->IsSSU2 ()))
{
// update MTU
auto mtu = i2p::util::net::GetMTU (host);
if (mtu)
{
LogPrint (eLogDebug, "Router: Our v6 MTU=", mtu);
int maxMTU = i2p::util::net::GetMaxMTU (host.to_v6 ());
if (mtu > maxMTU)
{
mtu = maxMTU;
LogPrint(eLogWarning, "Router: MTU dropped to upper limit of ", maxMTU, " bytes");
}
if (mtu && !address->IsSSU2 ()) // SSU1
mtu = (mtu >> 4) << 4; // round to multiple of 16
if (address->ssu) address->ssu->mtu = mtu;
}
}
updated = true;
}
if (host.is_v6 () && address->IsV6 () && address->ssu &&
(!address->ssu->mtu || updated))
{
// update MTU
auto mtu = i2p::util::net::GetMTU (host);
if (mtu)
{
LogPrint (eLogDebug, "Router: Our v6 MTU=", mtu);
int maxMTU = i2p::util::net::GetMaxMTU (host.to_v6 ());
if (mtu > maxMTU)
{
mtu = maxMTU;
LogPrint(eLogWarning, "Router: MTU dropped to upper limit of ", maxMTU, " bytes");
}
if (mtu && !address->IsSSU2 ()) // SSU1
mtu = (mtu >> 4) << 4; // round to multiple of 16
address->ssu->mtu = mtu;
updated = true;
}
}
}
auto ts = i2p::util::GetSecondsSinceEpoch ();
if (updated || ts > m_LastUpdateTime + ROUTER_INFO_UPDATE_INTERVAL)
@ -866,6 +869,43 @@ namespace i2p
UpdateRouterInfo ();
}
void RouterContext::SetMTU (int mtu, bool v4)
{
if (mtu < 1280 || mtu > 1500) return;
auto& addresses = m_RouterInfo.GetAddresses ();
for (auto& addr: addresses)
{
if (addr->ssu && ((v4 && addr->IsV4 ()) || (!v4 && addr->IsV6 ())))
{
if (!addr->IsSSU2 ()) // SSU1
{
// round to multiple of 16
if (v4)
{
if (mtu > 1484) mtu = 1484;
else
{
mtu -= 12;
mtu = (mtu >> 4) << 4;
mtu += 12;
}
}
else
{
if (mtu > 1488) mtu = 1488;
else
mtu = (mtu >> 4) << 4;
}
}
if (mtu)
{
addr->ssu->mtu = mtu;
LogPrint (eLogDebug, "Router: MTU for ", v4 ? "ipv4" : "ipv6", " address is set to ", mtu);
}
}
}
}
void RouterContext::UpdateNTCP2V6Address (const boost::asio::ip::address& host)
{
bool isYgg = i2p::util::net::IsYggdrasilAddress (host);