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calculate SSU2 session MTU and max payload size

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orignal 2022-07-13 19:35:18 -04:00
parent 1dd2bd0013
commit 3394bb4b8d
4 changed files with 97 additions and 75 deletions
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6
libi2pd/SSU2Session.h
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@ -33,7 +33,7 @@ namespace transport
const int SSU2_RELAY_NONCE_EXPIRATION_TIMEOUT = 10; // in seconds
const int SSU2_PEER_TEST_EXPIRATION_TIMEOUT = 60; // 60 seconds
const size_t SSU2_MAX_PACKET_SIZE = 1500;
const size_t SSU2_MTU = 1440; // TODO: should be 1456 for ipv4
const size_t SSU2_MTU = SSU2_MAX_PACKET_SIZE - IPV6_HEADER_SIZE - UDP_HEADER_SIZE; // TODO: ipv4
const size_t SSU2_MAX_PAYLOAD_SIZE = SSU2_MTU - 32;
const int SSU2_HANDSHAKE_RESEND_INTERVAL = 1; // in seconds
const int SSU2_RESEND_INTERVAL = 3; // in seconds
@ -186,7 +186,7 @@ namespace transport
struct SentPacket
{
uint8_t payload[SSU2_MAX_PAYLOAD_SIZE];
uint8_t payload[SSU2_MAX_PACKET_SIZE];
size_t payloadSize = 0;
uint32_t nextResendTime; // in seconds
int numResends = 0;
@ -273,6 +273,7 @@ namespace transport
bool ExtractEndpoint (const uint8_t * buf, size_t size, boost::asio::ip::udp::endpoint& ep);
size_t CreateEndpoint (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& ep);
std::shared_ptr<const i2p::data::RouterInfo::Address> FindLocalAddress () const;
void AdjustMaxPayloadSize ();
RouterStatus GetRouterStatus () const;
void SetRouterStatus (RouterStatus status) const;
std::shared_ptr<const i2p::data::RouterInfo> ExtractRouterInfo (const uint8_t * buf, size_t size);
@ -326,6 +327,7 @@ namespace transport
OnEstablished m_OnEstablished; // callback from Established
boost::asio::deadline_timer m_ConnectTimer;
SSU2TerminationReason m_TerminationReason;
size_t m_MaxPayloadSize;
};
inline uint64_t CreateHeaderMask (const uint8_t * kh, const uint8_t * nonce)