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try to send I2NP message in one packet, reduce or drop Ack block if necessary

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orignal 2022-07-24 19:44:49 -04:00
parent fe744f8f81
commit 617f45bc59
1 changed files with 37 additions and 12 deletions
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49
libi2pd/SSU2Session.cpp
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@ -264,31 +264,56 @@ namespace transport
{
auto nextResend = i2p::util::GetSecondsSinceEpoch () + SSU2_RESEND_INTERVAL;
auto packet = std::make_shared<SentPacket>();
packet->payloadSize += CreateAckBlock (packet->payload + packet->payloadSize, m_MaxPayloadSize - packet->payloadSize);
size_t ackBlockSize = CreateAckBlock (packet->payload, m_MaxPayloadSize);
packet->payloadSize += ackBlockSize;
while (!m_SendQueue.empty () && m_SentPackets.size () <= m_WindowSize)
{
auto msg = m_SendQueue.front ();
size_t len = msg->GetNTCP2Length ();
if (len + 3 < m_MaxPayloadSize - packet->payloadSize)
{
m_SendQueue.pop_front ();
packet->payloadSize += CreateI2NPBlock (packet->payload + packet->payloadSize, m_MaxPayloadSize - packet->payloadSize, std::move (msg));
}
else if (len > m_MaxPayloadSize) // message too long
size_t len = msg->GetNTCP2Length () + 3;
if (len > m_MaxPayloadSize) // message too long
{
m_SendQueue.pop_front ();
SendFragmentedMessage (msg);
}
else if (packet->payloadSize + len <= m_MaxPayloadSize)
{
m_SendQueue.pop_front ();
packet->payloadSize += CreateI2NPBlock (packet->payload + packet->payloadSize, m_MaxPayloadSize - packet->payloadSize, std::move (msg));
}
else
{
// create new packet and copy ack block
auto newPacket = std::make_shared<SentPacket>();
memcpy (newPacket->payload, packet->payload, ackBlockSize);
newPacket->payloadSize = ackBlockSize;
// complete current packet
if (packet->payloadSize > ackBlockSize) // more than just ack block
{
// try to add padding
if (packet->payloadSize + 16 < m_MaxPayloadSize)
packet->payloadSize += CreatePaddingBlock (packet->payload + packet->payloadSize, m_MaxPayloadSize - packet->payloadSize);
}
else
{
// reduce ack block
if (len + 8 < m_MaxPayloadSize)
{
// keep Ack block and drop some ranges
packet->payloadSize = m_MaxPayloadSize - len;
if (packet->payloadSize & 0x01) packet->payloadSize--; // make it even
htobe16buf (packet->payload + 1, packet->payloadSize - 3); // new block size
}
else // drop Ack block completely
packet->payloadSize = 0;
// msg fits single packet
m_SendQueue.pop_front ();
packet->payloadSize += CreateI2NPBlock (packet->payload + packet->payloadSize, m_MaxPayloadSize - packet->payloadSize, std::move (msg));
}
// send right a way
if (packet->payloadSize + 16 < m_MaxPayloadSize)
packet->payloadSize += CreatePaddingBlock (packet->payload + packet->payloadSize, m_MaxPayloadSize - packet->payloadSize);
uint32_t packetNum = SendData (packet->payload, packet->payloadSize);
packet->nextResendTime = nextResend;
m_SentPackets.emplace (packetNum, packet);
packet = std::make_shared<SentPacket>();
packet->payloadSize += CreateAckBlock (packet->payload + packet->payloadSize, m_MaxPayloadSize - packet->payloadSize);
packet = newPacket; // just ack block
}
};
if (packet->payloadSize)