mirror of
https://github.com/v2fly/v2ray-core.git
synced 2025-01-05 00:47:51 -05:00
83 lines
2.7 KiB
Go
83 lines
2.7 KiB
Go
package protocol
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import (
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"fmt"
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)
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// A PacketNumber in QUIC
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type PacketNumber uint64
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// PacketNumberLen is the length of the packet number in bytes
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type PacketNumberLen uint8
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const (
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// PacketNumberLenInvalid is the default value and not a valid length for a packet number
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PacketNumberLenInvalid PacketNumberLen = 0
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// PacketNumberLen1 is a packet number length of 1 byte
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PacketNumberLen1 PacketNumberLen = 1
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// PacketNumberLen2 is a packet number length of 2 bytes
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PacketNumberLen2 PacketNumberLen = 2
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// PacketNumberLen4 is a packet number length of 4 bytes
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PacketNumberLen4 PacketNumberLen = 4
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)
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// The PacketType is the Long Header Type
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type PacketType uint8
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const (
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// PacketTypeInitial is the packet type of an Initial packet
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PacketTypeInitial PacketType = 0x7f
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// PacketTypeRetry is the packet type of a Retry packet
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PacketTypeRetry PacketType = 0x7e
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// PacketTypeHandshake is the packet type of a Handshake packet
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PacketTypeHandshake PacketType = 0x7d
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// PacketType0RTT is the packet type of a 0-RTT packet
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PacketType0RTT PacketType = 0x7c
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)
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func (t PacketType) String() string {
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switch t {
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case PacketTypeInitial:
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return "Initial"
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case PacketTypeRetry:
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return "Retry"
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case PacketTypeHandshake:
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return "Handshake"
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case PacketType0RTT:
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return "0-RTT Protected"
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default:
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return fmt.Sprintf("unknown packet type: %d", t)
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}
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}
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// A ByteCount in QUIC
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type ByteCount uint64
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// MaxByteCount is the maximum value of a ByteCount
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const MaxByteCount = ByteCount(1<<62 - 1)
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// An ApplicationErrorCode is an application-defined error code.
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type ApplicationErrorCode uint16
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// MaxReceivePacketSize maximum packet size of any QUIC packet, based on
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// ethernet's max size, minus the IP and UDP headers. IPv6 has a 40 byte header,
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// UDP adds an additional 8 bytes. This is a total overhead of 48 bytes.
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// Ethernet's max packet size is 1500 bytes, 1500 - 48 = 1452.
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const MaxReceivePacketSize ByteCount = 1452 - 64
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// DefaultTCPMSS is the default maximum packet size used in the Linux TCP implementation.
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// Used in QUIC for congestion window computations in bytes.
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const DefaultTCPMSS ByteCount = 1460
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// MinInitialPacketSize is the minimum size an Initial packet is required to have.
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const MinInitialPacketSize = 1200
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// MaxClientHellos is the maximum number of times we'll send a client hello
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// The value 3 accounts for:
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// * one failure due to an incorrect or missing source-address token
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// * one failure due the server's certificate chain being unavailable and the server being unwilling to send it without a valid source-address token
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const MaxClientHellos = 3
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// MinConnectionIDLenInitial is the minimum length of the destination connection ID on an Initial packet.
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const MinConnectionIDLenInitial = 8
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