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don't send instant Ack for out-of-sequence message

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orignal 2022-03-27 09:26:45 -04:00
parent 371a339b18
commit 7d5f51e357
2 changed files with 14 additions and 15 deletions
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27
libi2pd/SSU2.cpp
View File

@ -113,11 +113,7 @@ namespace transport
htobe16buf (payload + 1, 4);
htobe32buf (payload + 3, i2p::util::GetSecondsSinceEpoch ());
size_t payloadSize = 7;
uint8_t paddingSize = (rand () & 0x0F) + 1; // 1 - 16
payload[payloadSize] = eSSU2BlkPadding;
htobe16buf (payload + payloadSize + 1, paddingSize);
memset (payload + payloadSize + 3, 0, paddingSize);
payloadSize += paddingSize + 3;
payloadSize += CreatePaddingBlock (payload + payloadSize, 40 - payloadSize, 1);
// KDF for session request
m_NoiseState->MixHash ({ {header.buf, 16}, {headerX, 16} }); // h = SHA256(h || header)
m_NoiseState->MixHash (m_EphemeralKeys->GetPublicKey (), 32); // h = SHA256(h || aepk);
@ -370,7 +366,9 @@ namespace transport
LogPrint (eLogError, "SSU2: SessionConfirmed malformed RouterInfo block");
return false;
}
if (!ri->GetSSU2AddressWithStaticKey (S))
SetRemoteIdentity (ri->GetRouterIdentity ());
m_Address = ri->GetSSU2AddressWithStaticKey (S);
if (!m_Address)
{
LogPrint (eLogError, "SSU2: No SSU2 address with static key found in SessionConfirmed");
return false;
@ -416,11 +414,7 @@ namespace transport
htobe16buf (payload + 1, 4);
htobe32buf (payload + 3, i2p::util::GetSecondsSinceEpoch ());
size_t payloadSize = 7;
uint8_t paddingSize = (rand () & 0x0F) + 1; // 1 - 16
payload[payloadSize] = eSSU2BlkPadding;
htobe16buf (payload + payloadSize + 1, paddingSize);
memset (payload + payloadSize + 3, 0, paddingSize);
payloadSize += paddingSize + 3;
payloadSize += CreatePaddingBlock (payload + payloadSize, 40 - payloadSize, 1);
// encrypt
const uint8_t nonce[12] = {0};
i2p::crypto::AEADChaCha20Poly1305 (payload, payloadSize, h, 32, m_Address->i, nonce, payload, payloadSize + 16, true);
@ -572,8 +566,11 @@ namespace transport
HandlePayload (payload, payloadSize);
m_LastActivityTimestamp = i2p::util::GetSecondsSinceEpoch ();
m_NumReceivedBytes += len;
if (packetNum > m_ReceivePacketNum) m_ReceivePacketNum = packetNum;
SendQuickAck (); // TODO: don't send too requently
if (packetNum > m_ReceivePacketNum)
{
m_ReceivePacketNum = packetNum;
SendQuickAck (); // TODO: don't send too requently
}
}
void SSU2Session::HandlePayload (const uint8_t * buf, size_t len)
@ -734,10 +731,12 @@ namespace transport
return 8;
}
size_t SSU2Session::CreatePaddingBlock (uint8_t * buf, size_t len)
size_t SSU2Session::CreatePaddingBlock (uint8_t * buf, size_t len, size_t minSize)
{
if (len < minSize) return 0;
uint8_t paddingSize = rand () & 0x0F; // 0 - 15
if (paddingSize > len) paddingSize = len;
else if (paddingSize < minSize) paddingSize = minSize;
if (paddingSize)
{
buf[0] = eSSU2BlkPadding;

2
libi2pd/SSU2.h
View File

@ -135,7 +135,7 @@ namespace transport
size_t CreateAddressBlock (const boost::asio::ip::udp::endpoint& ep, uint8_t * buf, size_t len);
size_t CreateAckBlock (uint8_t * buf, size_t len);
size_t CreatePaddingBlock (uint8_t * buf, size_t len);
size_t CreatePaddingBlock (uint8_t * buf, size_t len, size_t minSize = 0);
private: