98 lines
3.0 KiB
Go
98 lines
3.0 KiB
Go
|
package protocol
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"time"
|
||
|
|
)
|
||
|
|
|
||
|
|
// 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)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
type ECN uint8
|
||
|
|
|
||
|
|
const (
|
||
|
|
ECNNon ECN = iota // 00
|
||
|
|
ECT1 // 01
|
||
|
|
ECT0 // 10
|
||
|
|
ECNCE // 11
|
||
|
|
)
|
||
|
|
|
||
|
|
// A ByteCount in QUIC
|
||
|
|
type ByteCount int64
|
||
|
|
|
||
|
|
// MaxByteCount is the maximum value of a ByteCount
|
||
|
|
const MaxByteCount = ByteCount(1<<62 - 1)
|
||
|
|
|
||
|
|
// InvalidByteCount is an invalid byte count
|
||
|
|
const InvalidByteCount ByteCount = -1
|
||
|
|
|
||
|
|
// A StatelessResetToken is a stateless reset token.
|
||
|
|
type StatelessResetToken [16]byte
|
||
|
|
|
||
|
|
// MaxPacketBufferSize 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 MaxPacketBufferSize ByteCount = 1452
|
||
|
|
|
||
|
|
// MinInitialPacketSize is the minimum size an Initial packet is required to have.
|
||
|
|
const MinInitialPacketSize = 1200
|
||
|
|
|
||
|
|
// MinUnknownVersionPacketSize is the minimum size a packet with an unknown version
|
||
|
|
// needs to have in order to trigger a Version Negotiation packet.
|
||
|
|
const MinUnknownVersionPacketSize = MinInitialPacketSize
|
||
|
|
|
||
|
|
// MinStatelessResetSize is the minimum size of a stateless reset packet that we send
|
||
|
|
const MinStatelessResetSize = 1 /* first byte */ + 20 /* max. conn ID length */ + 4 /* max. packet number length */ + 1 /* min. payload length */ + 16 /* token */
|
||
|
|
|
||
|
|
// MinConnectionIDLenInitial is the minimum length of the destination connection ID on an Initial packet.
|
||
|
|
const MinConnectionIDLenInitial = 8
|
||
|
|
|
||
|
|
// DefaultAckDelayExponent is the default ack delay exponent
|
||
|
|
const DefaultAckDelayExponent = 3
|
||
|
|
|
||
|
|
// MaxAckDelayExponent is the maximum ack delay exponent
|
||
|
|
const MaxAckDelayExponent = 20
|
||
|
|
|
||
|
|
// DefaultMaxAckDelay is the default max_ack_delay
|
||
|
|
const DefaultMaxAckDelay = 25 * time.Millisecond
|
||
|
|
|
||
|
|
// MaxMaxAckDelay is the maximum max_ack_delay
|
||
|
|
const MaxMaxAckDelay = (1<<14 - 1) * time.Millisecond
|
||
|
|
|
||
|
|
// MaxConnIDLen is the maximum length of the connection ID
|
||
|
|
const MaxConnIDLen = 20
|
||
|
|
|
||
|
|
// InvalidPacketLimitAES is the maximum number of packets that we can fail to decrypt when using
|
||
|
|
// AEAD_AES_128_GCM or AEAD_AES_265_GCM.
|
||
|
|
const InvalidPacketLimitAES = 1 << 52
|
||
|
|
|
||
|
|
// InvalidPacketLimitChaCha is the maximum number of packets that we can fail to decrypt when using AEAD_CHACHA20_POLY1305.
|
||
|
|
const InvalidPacketLimitChaCha = 1 << 36
|