- func IsSupportedVersion(supported VersionNumber, v VersionNumber) bool
- func IsValidVersion(v VersionNumber) bool
- type ApplicationErrorCode
- type ByteCount
- type ConnectionID
- type EncryptionLevel
- type PacketNumber
- type PacketNumberLen
- type PacketType
- type Perspective
- type StreamID
- type StreamType
- type VersionNumber
const ConnectionFlowControlMultiplier = 1.5
ConnectionFlowControlMultiplier determines how much larger the connection flow control windows needs to be relative to any stream's flow control window This is the value that Chromium is using
CookieExpiryTime is the valid time of a cookie
const DefaultConnectionIDLength = 4
DefaultConnectionIDLength is the connection ID length that is used for multiplexed connections if no other value is configured.
DefaultHandshakeTimeout is the default timeout for a connection until the crypto handshake succeeds.
DefaultIdleTimeout is the default idle timeout
const DefaultMaxIncomingStreams = 100
DefaultMaxIncomingStreams is the maximum number of streams that a peer may open
const DefaultMaxIncomingUniStreams = 100
DefaultMaxIncomingUniStreams is the maximum number of unidirectional streams that a peer may open
const DefaultMaxReceiveConnectionFlowControlWindow = 15 * (1 << 20) // 12 MB
DefaultMaxReceiveConnectionFlowControlWindow is the default connection-level flow control window for receiving data, for the server
const DefaultMaxReceiveStreamFlowControlWindow = 6 * (1 << 20) // 6 MB
DefaultMaxReceiveStreamFlowControlWindow is the default maximum stream-level flow control window for receiving data, for the server
InitialMaxData is the connection-level flow control window for receiving data
const InitialMaxStreamData = (1 << 10) * 512 // 512 kb
InitialMaxStreamData is the stream-level flow control window for receiving data
const MaxAcceptQueueSize = 32
MaxAcceptQueueSize is the maximum number of sessions that the server queues for accepting. If the queue is full, new connection attempts will be rejected.
MaxByteCount is the maximum value of a ByteCount
const MaxCryptoStreamOffset = 16 * (1 << 10)
MaxCryptoStreamOffset is the maximum offset allowed on any of the crypto streams. This limits the size of the ClientHello and Certificates that can be received.
const MaxNonRetransmittableAcks = 19
MaxNonRetransmittableAcks is the maximum number of packets containing an ACK, but no retransmittable frames, that we send in a row
const MaxOutstandingSentPackets = 2 * defaultMaxCongestionWindowPackets
MaxOutstandingSentPackets is maximum number of packets saved for retransmission. When reached, it imposes a soft limit on sending new packets: Sending ACKs and retransmission is still allowed, but now new regular packets can be sent.
const MaxPacketSizeIPv4 = 1252
MaxPacketSizeIPv4 is the maximum packet size that we use for sending IPv4 packets.
const MaxPacketSizeIPv6 = 1232
MaxPacketSizeIPv6 is the maximum packet size that we use for sending IPv6 packets.
const MaxSessionUnprocessedPackets = defaultMaxCongestionWindowPackets
MaxSessionUnprocessedPackets is the max number of packets stored in each session that are not yet processed.
const MaxStreamFrameSorterGaps = 1000
MaxStreamFrameSorterGaps is the maximum number of gaps between received StreamFrames prevents DoS attacks against the streamFrameSorter
const MaxTrackedReceivedAckRanges = defaultMaxCongestionWindowPackets
MaxTrackedReceivedAckRanges is the maximum number of ACK ranges tracked
MaxTrackedSentPackets is maximum number of sent packets saved for retransmission. When reached, no more packets will be sent. This value *must* be larger than MaxOutstandingSentPackets.
const MaxTrackedSkippedPackets = 10
MaxTrackedSkippedPackets is the maximum number of skipped packet numbers the SentPacketHandler keep track of for Optimistic ACK attack mitigation
const MaxUndecryptablePackets = 10
MaxUndecryptablePackets limits the number of undecryptable packets that are queued in the session.
const MinConnectionIDLenInitial = 8
MinConnectionIDLenInitial is the minimum length of the destination connection ID on an Initial packet.
const MinInitialPacketSize = 1200
MinInitialPacketSize is the minimum size an Initial packet is required to have.
MinPacingDelay is the minimum duration that is used for packet pacing If the packet packing frequency is higher, multiple packets might be sent at once. Example: For a packet pacing delay of 20 microseconds, we would send 5 packets at once, wait for 100 microseconds, and so forth.
MinRemoteIdleTimeout is the minimum value that we accept for the remote idle timeout
const MinStatelessResetSize = 1 + 22 + 16 /* token */
MinStatelessResetSize is the minimum size of a stateless reset packet
RetiredConnectionIDDeleteTimeout is the time we keep closed sessions around in order to retransmit the CONNECTION_CLOSE. after this time all information about the old connection will be deleted
const WindowUpdateThreshold = 0.25
WindowUpdateThreshold is the fraction of the receive window that has to be consumed before an higher offset is advertised to the client
SupportedVersions lists the versions that the server supports must be in sorted descending order
func IsSupportedVersion ¶
IsSupportedVersion returns true if the server supports this version
type ApplicationErrorCode ¶
type ApplicationErrorCode uint16
An ApplicationErrorCode is an application-defined error code.
type ByteCount uint64
A ByteCount in QUIC
DefaultMaxCongestionWindow is the default for the max congestion window
const DefaultTCPMSS ByteCount = 1460
DefaultTCPMSS is the default maximum packet size used in the Linux TCP implementation. Used in QUIC for congestion window computations in bytes.
InitialCongestionWindow is the initial congestion window in QUIC packets
const MaxAckFrameSize ByteCount = 1000
MaxAckFrameSize is the maximum size for an ACK frame that we write Due to the varint encoding, ACK frames can grow (almost) indefinitely large. The MaxAckFrameSize should be large enough to encode many ACK range, but must ensure that a maximum size ACK frame fits into one packet.
const MaxReceivePacketSize ByteCount = 1452 - 64
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 MinStreamFrameSize ByteCount = 128
MinStreamFrameSize is the minimum size that has to be left in a packet, so that we add another STREAM frame. This avoids splitting up STREAM frames into small pieces, which has 2 advantages: 1. it reduces the framing overhead 2. it reduces the head-of-line blocking, when a packet is lost
type ConnectionID ¶
type ConnectionID byte
A ConnectionID in QUIC
func GenerateConnectionID ¶
GenerateConnectionID generates a connection ID using cryptographic random
GenerateConnectionIDForInitial generates a connection ID for the Initial packet. It uses a length randomly chosen between 8 and 18 bytes.
func ReadConnectionID ¶
ReadConnectionID reads a connection ID of length len from the given io.Reader. It returns io.EOF if there are not enough bytes to read.
Bytes returns the byte representation
Equal says if two connection IDs are equal
Len returns the length of the connection ID in bytes
type EncryptionLevel ¶
type EncryptionLevel int
EncryptionLevel is the encryption level Default value is Unencrypted
const ( // EncryptionUnspecified is a not specified encryption level EncryptionUnspecified EncryptionLevel = iota // EncryptionInitial is the Initial encryption level EncryptionInitial // EncryptionHandshake is the Handshake encryption level EncryptionHandshake // Encryption1RTT is the 1-RTT encryption level Encryption1RTT )
type PacketNumber ¶
type PacketNumber uint64
A PacketNumber in QUIC
const SkipPacketAveragePeriodLength PacketNumber = 500
SkipPacketAveragePeriodLength is the average period length in which one packet number is skipped to prevent an Optimistic ACK attack
type PacketNumberLen ¶
type PacketNumberLen uint8
PacketNumberLen is the length of the packet number in bytes
const ( // PacketNumberLenInvalid is the default value and not a valid length for a packet number PacketNumberLenInvalid PacketNumberLen = 0 // PacketNumberLen1 is a packet number length of 1 byte PacketNumberLen1 PacketNumberLen = 1 // PacketNumberLen2 is a packet number length of 2 bytes PacketNumberLen2 PacketNumberLen = 2 // PacketNumberLen3 is a packet number length of 3 bytes PacketNumberLen3 PacketNumberLen = 3 // PacketNumberLen4 is a packet number length of 4 bytes PacketNumberLen4 PacketNumberLen = 4 )
func GetPacketNumberLength ¶
GetPacketNumberLength gets the minimum length needed to fully represent the packet number
GetPacketNumberLengthForHeader gets the length of the packet number for the public header it never chooses a PacketNumberLen of 1 byte, since this is too short under certain circumstances
type PacketType ¶
type PacketType uint8
The PacketType is the Long Header Type
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 )
type Perspective ¶
type Perspective int
Perspective determines if we're acting as a server or a client
Opposite returns the perspective of the peer
type StreamID uint64
A StreamID in QUIC
func FirstStream ¶
FirstStream returns the first valid stream ID
func MaxStreamID ¶
MaxStreamID is the highest stream ID that a peer is allowed to open, when it is allowed to open numStreams.
func (StreamID) InitiatedBy ¶
InitiatedBy says if the stream was initiated by the client or by the server
StreamNum returns how many streams in total are below this Example: for stream 9 it returns 3 (i.e. streams 1, 5 and 9)
type StreamType ¶
type StreamType uint8
StreamType encodes if this is a unidirectional or bidirectional stream
type VersionNumber ¶
type VersionNumber uint32
VersionNumber is a version number as int
const ( VersionTLS VersionNumber = 0x51474fff VersionWhatever VersionNumber = 1 // for when the version doesn't matter VersionUnknown VersionNumber = math.MaxUint32 )
The version numbers, making grepping easier
func ChooseSupportedVersion ¶
ChooseSupportedVersion finds the best version in the overlap of ours and theirs ours is a slice of versions that we support, sorted by our preference (descending) theirs is a slice of versions offered by the peer. The order does not matter. The bool returned indicates if a matching version was found.
func GetGreasedVersions ¶
GetGreasedVersions adds one reserved version number to a slice of version numbers, at a random position
func StripGreasedVersions ¶
StripGreasedVersions strips all greased versions from a slice of versions