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protocol.go
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protocol.go
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package protocol
import (
"fmt"
)
// A PacketNumber in QUIC
type PacketNumber uint64
// The PacketType is the Long Header Type
type PacketType uint8
const (
// PacketTypeInitial is the packet type of an Initial packet
PacketTypeInitial PacketType = 1 + iota
// PacketTypeRetry is the packet type of a Retry packet
PacketTypeRetry
// PacketTypeHandshake is the packet type of a Handshake packet
PacketTypeHandshake
// PacketType0RTT is the packet type of a 0-RTT packet
PacketType0RTT
)
func (t PacketType) String() string {
switch t {
case PacketTypeInitial:
return "Initial"
case PacketTypeRetry:
return "Retry"
case PacketTypeHandshake:
return "Handshake"
case PacketType0RTT:
return "0-RTT Protected"
default:
return fmt.Sprintf("unknown packet type: %d", t)
}
}
// A ByteCount in QUIC
type ByteCount uint64
// MaxByteCount is the maximum value of a ByteCount
const MaxByteCount = ByteCount(1<<62 - 1)
// An ApplicationErrorCode is an application-defined error code.
type ApplicationErrorCode uint16
// MaxReceivePacketSize maximum packet size of any QUIC packet, based on
// ethernet's max size, minus the IP and UDP headers. IPv6 has a 40 byte header,
// UDP adds an additional 8 bytes. This is a total overhead of 48 bytes.
// Ethernet's max packet size is 1500 bytes, 1500 - 48 = 1452.
const MaxReceivePacketSize ByteCount = 1452 - 64
// DefaultTCPMSS is the default maximum packet size used in the Linux TCP implementation.
// Used in QUIC for congestion window computations in bytes.
const DefaultTCPMSS ByteCount = 1460
// MinInitialPacketSize is the minimum size an Initial packet is required to have.
const MinInitialPacketSize = 1200
// MinStatelessResetSize is the minimum size of a stateless reset packet
const MinStatelessResetSize = 1 /* first byte */ + 22 /* random bytes */ + 16 /* token */
// MinConnectionIDLenInitial is the minimum length of the destination connection ID on an Initial packet.
const MinConnectionIDLenInitial = 8