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don't request relay tag for every session if we have enough introducers

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orignal 2024-06-08 19:28:05 -04:00
parent 4178ac8eac
commit 0b97b4294c
2 changed files with 9 additions and 4 deletions
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1
libi2pd/SSU2.h
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@ -72,6 +72,7 @@ namespace transport
bool IsSupported (const boost::asio::ip::address& addr) const;
uint16_t GetPort (bool v4) const;
std::mt19937& GetRng () { return m_Rng; }
bool IsMaxNumIntroducers (bool v4) const { return (v4 ? m_Introducers.size () : m_IntroducersV6.size ()) >= SSU2_MAX_NUM_INTRODUCERS; }
bool IsSyncClockFromPeers () const { return m_IsSyncClockFromPeers; };
void AdjustTimeOffset (int64_t offset, std::shared_ptr<const i2p::data::IdentityEx> from);

4
libi2pd/SSU2Session.cpp
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@ -679,12 +679,16 @@ namespace transport
htobe32buf (payload + 3, (ts + 500)/1000);
size_t payloadSize = 7;
if (GetRouterStatus () == eRouterStatusFirewalled && m_Address->IsIntroducer ())
{
if (!m_Server.IsMaxNumIntroducers (m_RemoteEndpoint.address ().is_v4 ()) ||
m_Server.GetRng ()() & 0x01) // request tag with probability 1/2 if we have enough introducers
{
// relay tag request
payload[payloadSize] = eSSU2BlkRelayTagRequest;
memset (payload + payloadSize + 1, 0, 2); // size = 0
payloadSize += 3;
}
}
payloadSize += CreatePaddingBlock (payload + payloadSize, 40 - payloadSize, 1);
// KDF for session request
m_NoiseState->MixHash ({ {header.buf, 16}, {headerX, 16} }); // h = SHA256(h || header)