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periodic sending ack requests in ECEISX25519 session and dead path detection in I2CP

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orignal 2024-08-15 13:35:51 -04:00
parent 09dbe9fc03
commit d47ae3012a
3 changed files with 66 additions and 18 deletions
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64
libi2pd/ECIESX25519AEADRatchetSession.cpp
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@ -229,6 +229,29 @@ namespace garlic
tagsetNsr->NextSessionTagRatchet ();
}
bool ECIESX25519AEADRatchetSession::MessageConfirmed (uint32_t msgID)
{
auto ret = GarlicRoutingSession::MessageConfirmed (msgID); // LeaseSet
if (m_AckRequestMsgID && m_AckRequestMsgID == msgID)
{
m_AckRequestMsgID = 0;
m_AckRequestNumAttempts = 0;
ret = true;
}
return ret;
}
bool ECIESX25519AEADRatchetSession::CleanupUnconfirmedTags ()
{
if (m_AckRequestMsgID && m_AckRequestNumAttempts > ECIESX25519_ACK_REQUEST_MAX_NUM_ATTEMPTS)
{
m_AckRequestMsgID = 0;
m_AckRequestNumAttempts = 0;
return true;
}
return false;
}
bool ECIESX25519AEADRatchetSession::HandleNewIncomingSession (const uint8_t * buf, size_t len)
{
if (!GetOwner ()) return false;
@ -335,7 +358,7 @@ namespace garlic
{
uint32_t tagsetid = bufbe16toh (buf + offset1); offset1 += 2; // tagsetid
uint16_t n = bufbe16toh (buf + offset1); offset1 += 2; // N
MessageConfirmed ((tagsetid << 16) + n); // msgid
MessageConfirmed ((tagsetid << 16) + n); // msgid = (tagsetid << 16) + N
}
break;
}
@ -860,6 +883,7 @@ namespace garlic
{
uint64_t ts = i2p::util::GetMillisecondsSinceEpoch ();
size_t payloadLen = 0;
bool sendAckRequest = false;
if (first) payloadLen += 7;// datatime
if (msg)
{
@ -878,13 +902,28 @@ namespace garlic
payloadLen += leaseSet->GetBufferLen () + DATABASE_STORE_HEADER_SIZE + 13;
if (!first)
{
// ack request
// ack request for LeaseSet
m_AckRequestMsgID = m_SendTagset->GetMsgID ();
sendAckRequest = true;
// update LeaseSet status
SetLeaseSetUpdateStatus (eLeaseSetSubmitted);
SetLeaseSetUpdateMsgID ((m_SendTagset->GetTagSetID () << 16) + m_SendTagset->GetNextIndex ()); // (tagsetid << 16) + N
SetLeaseSetUpdateMsgID (m_AckRequestMsgID);
SetLeaseSetSubmissionTime (ts);
payloadLen += 4;
}
}
if (!sendAckRequest && !first &&
((!m_AckRequestMsgID && ts > m_LastAckRequestSendTime + ECIESX25519_ACK_REQUEST_INTERVAL) || // regular request
(m_AckRequestMsgID && ts > m_LastAckRequestSendTime + LEASESET_CONFIRMATION_TIMEOUT))) // previous request failed. try again
{
// not LeaseSet
m_AckRequestMsgID = m_SendTagset->GetMsgID ();
if (m_AckRequestMsgID)
{
m_AckRequestNumAttempts++;
sendAckRequest = true;
}
}
if (sendAckRequest) payloadLen += 4;
if (m_AckRequests.size () > 0)
payloadLen += m_AckRequests.size ()*4 + 3;
if (m_SendReverseKey)
@ -936,16 +975,15 @@ namespace garlic
}
// LeaseSet
if (leaseSet)
{
offset += CreateLeaseSetClove (leaseSet, ts, payload + offset, payloadLen - offset);
if (!first)
{
// ack request
payload[offset] = eECIESx25519BlkAckRequest; offset++;
htobe16buf (payload + offset, 1); offset += 2;
payload[offset] = 0; offset++; // flags
}
}
// ack request
if (sendAckRequest)
{
payload[offset] = eECIESx25519BlkAckRequest; offset++;
htobe16buf (payload + offset, 1); offset += 2;
payload[offset] = 0; offset++; // flags
m_LastAckRequestSendTime = ts;
}
// msg
if (msg)
offset += CreateGarlicClove (msg, payload + offset, payloadLen - offset);

18
libi2pd/ECIESX25519AEADRatchetSession.h
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@ -30,7 +30,9 @@ namespace garlic
const int ECIESX25519_SEND_INACTIVITY_TIMEOUT = 5000; // number of milliseconds we can send empty(pyaload only) packet after
const int ECIESX25519_SEND_EXPIRATION_TIMEOUT = 480; // in seconds
const int ECIESX25519_RECEIVE_EXPIRATION_TIMEOUT = 600; // in seconds
const int ECIESX25519_PREVIOUS_TAGSET_EXPIRATION_TIMEOUT = 180; // 180
const int ECIESX25519_PREVIOUS_TAGSET_EXPIRATION_TIMEOUT = 180; // in seconds
const int ECIESX25519_ACK_REQUEST_INTERVAL = 33000; // in milliseconds
const int ECIESX25519_ACK_REQUEST_MAX_NUM_ATTEMPTS = 3;
const int ECIESX25519_TAGSET_MAX_NUM_TAGS = 8192; // number of tags we request new tagset after
const int ECIESX25519_MIN_NUM_GENERATED_TAGS = 24;
const int ECIESX25519_MAX_NUM_GENERATED_TAGS = 320;
@ -57,6 +59,8 @@ namespace garlic
int GetTagSetID () const { return m_TagSetID; };
void SetTagSetID (int tagsetID) { m_TagSetID = tagsetID; };
uint32_t GetMsgID () const { return (m_TagSetID << 16) + m_NextIndex; }; // (tagsetid << 16) + N
private:
i2p::data::Tag<64> m_SessionTagKeyData;
@ -178,14 +182,16 @@ namespace garlic
bool IsReadyToSend () const { return m_State != eSessionStateNewSessionSent; };
bool IsTerminated () const { return m_IsTerminated; }
uint64_t GetLastActivityTimestamp () const { return m_LastActivityTimestamp; };
bool CleanupUnconfirmedTags (); // return true if unaswered Ack requests, called from I2CP
protected:
i2p::crypto::NoiseSymmetricState& GetNoiseState () { return *this; };
void SetNoiseState (const i2p::crypto::NoiseSymmetricState& state) { GetNoiseState () = state; };
void CreateNonce (uint64_t seqn, uint8_t * nonce);
void HandlePayload (const uint8_t * buf, size_t len, const std::shared_ptr<ReceiveRatchetTagSet>& receiveTagset, int index);
bool MessageConfirmed (uint32_t msgID);
private:
bool GenerateEphemeralKeysAndEncode (uint8_t * buf); // buf is 32 bytes
@ -219,11 +225,15 @@ namespace garlic
m_LastSentTimestamp = 0; // in milliseconds
std::shared_ptr<RatchetTagSet> m_SendTagset, m_NSRSendTagset;
std::unique_ptr<i2p::data::IdentHash> m_Destination;// TODO: might not need it
std::list<std::pair<uint16_t, int> > m_AckRequests; // (tagsetid, index)
std::list<std::pair<uint16_t, int> > m_AckRequests; // incoming (tagsetid, index)
bool m_SendReverseKey = false, m_SendForwardKey = false, m_IsTerminated = false;
std::unique_ptr<DHRatchet> m_NextReceiveRatchet, m_NextSendRatchet;
uint8_t m_PaddingSizes[32], m_NextPaddingSize;
uint64_t m_LastAckRequestSendTime = 0; // milliseconds
uint32_t m_AckRequestMsgID = 0;
int m_AckRequestNumAttempts = 0;
public:
// for HTTP only

2
libi2pd/Garlic.h
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@ -109,7 +109,7 @@ namespace garlic
GarlicRoutingSession ();
virtual ~GarlicRoutingSession ();
virtual std::shared_ptr<I2NPMessage> WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg) = 0;
virtual bool CleanupUnconfirmedTags () { return false; }; // for I2CP, override in ElGamalAESSession
virtual bool CleanupUnconfirmedTags () { return false; }; // for I2CP, override in ElGamalAESSession and ECIESX25519AEADRatchetSession
virtual bool MessageConfirmed (uint32_t msgID);
virtual bool IsRatchets () const { return false; };
virtual bool IsReadyToSend () const { return true; };