98 lines
3.0 KiB
Go
98 lines
3.0 KiB
Go
package protocol
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import (
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"fmt"
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"time"
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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 = 1 + iota
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// PacketTypeRetry is the packet type of a Retry packet
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PacketTypeRetry
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// PacketTypeHandshake is the packet type of a Handshake packet
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PacketTypeHandshake
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// PacketType0RTT is the packet type of a 0-RTT packet
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PacketType0RTT
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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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type ECN uint8
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const (
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ECNNon ECN = iota // 00
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ECT1 // 01
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ECT0 // 10
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ECNCE // 11
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)
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// A ByteCount in QUIC
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type ByteCount int64
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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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// InvalidByteCount is an invalid byte count
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const InvalidByteCount ByteCount = -1
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// A StatelessResetToken is a stateless reset token.
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type StatelessResetToken [16]byte
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// MaxPacketBufferSize 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 MaxPacketBufferSize ByteCount = 1452
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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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// MinUnknownVersionPacketSize is the minimum size a packet with an unknown version
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// needs to have in order to trigger a Version Negotiation packet.
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const MinUnknownVersionPacketSize = MinInitialPacketSize
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// MinStatelessResetSize is the minimum size of a stateless reset packet that we send
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const MinStatelessResetSize = 1 /* first byte */ + 20 /* max. conn ID length */ + 4 /* max. packet number length */ + 1 /* min. payload length */ + 16 /* token */
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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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// DefaultAckDelayExponent is the default ack delay exponent
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const DefaultAckDelayExponent = 3
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// MaxAckDelayExponent is the maximum ack delay exponent
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const MaxAckDelayExponent = 20
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// DefaultMaxAckDelay is the default max_ack_delay
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const DefaultMaxAckDelay = 25 * time.Millisecond
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// MaxMaxAckDelay is the maximum max_ack_delay
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const MaxMaxAckDelay = (1<<14 - 1) * time.Millisecond
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// MaxConnIDLen is the maximum length of the connection ID
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const MaxConnIDLen = 20
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// InvalidPacketLimitAES is the maximum number of packets that we can fail to decrypt when using
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// AEAD_AES_128_GCM or AEAD_AES_265_GCM.
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const InvalidPacketLimitAES = 1 << 52
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// InvalidPacketLimitChaCha is the maximum number of packets that we can fail to decrypt when using AEAD_CHACHA20_POLY1305.
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const InvalidPacketLimitChaCha = 1 << 36
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