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handle Ack ranges

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orignal 2022-04-01 15:09:35 -04:00
parent 81207999eb
commit eb561bb0c2
2 changed files with 24 additions and 4 deletions
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27
libi2pd/SSU2.cpp
View File

@ -794,17 +794,36 @@ namespace transport
void SSU2Session::HandleAck (const uint8_t * buf, size_t len)
{
if (m_SentPackets.empty ()) return;
if (len < 5) return;
// acnt
uint32_t ackThrough = bufbe32toh (buf);
uint32_t firstPacketNum = ackThrough > buf[4] ? ackThrough - buf[4] : 0; // acnt
uint32_t firstPacketNum = ackThrough > buf[4] ? ackThrough - buf[4] : 0;
HandleAckRange (firstPacketNum, ackThrough); // acnt
// ranges
len -= 5;
const uint8_t * ranges = buf + 5;
while (len > 0 && firstPacketNum)
{
uint32_t lastPacketNum = firstPacketNum - 1;
if (*ranges > lastPacketNum) break;
lastPacketNum -= *ranges; ranges++; // nacks
if (*ranges > lastPacketNum) break;
firstPacketNum -= *ranges; ranges++; // acks
len -= 2;
HandleAckRange (firstPacketNum, lastPacketNum);
}
}
void SSU2Session::HandleAckRange (uint32_t firstPacketNum, uint32_t lastPacketNum)
{
auto it = m_SentPackets.begin ();
while (it != m_SentPackets.end () && it->first < firstPacketNum) it++; // find first acked packet
if (it == m_SentPackets.end ()) return; // not found
auto it1 = it;
while (it1 != m_SentPackets.end () && it1->first <= ackThrough) it1++;
while (it1 != m_SentPackets.end () && it1->first <= lastPacketNum) it1++;
it1--;
m_SentPackets.erase (it, it1);
// TODO: handle ranges
}
}
bool SSU2Session::ExtractEndpoint (const uint8_t * buf, size_t size, boost::asio::ip::udp::endpoint& ep)
{

1
libi2pd/SSU2.h
View File

@ -153,6 +153,7 @@ namespace transport
bool HandlePayload (const uint8_t * buf, size_t len); // returns true is contains data
void HandleAck (const uint8_t * buf, size_t len);
void HandleAckRange (uint32_t firstPacketNum, uint32_t lastPacketNum);
bool ExtractEndpoint (const uint8_t * buf, size_t size, boost::asio::ip::udp::endpoint& ep);
std::shared_ptr<const i2p::data::RouterInfo> ExtractRouterInfo (const uint8_t * buf, size_t size);
void CreateNonce (uint64_t seqn, uint8_t * nonce);