make the protocol package internal

internal/protocol/protocol.go

@@ -0,0 +1,59 @@
+package protocol
+
+import "math"
+
+// A PacketNumber in QUIC
+type PacketNumber uint64
+
+// PacketNumberLen is the length of the packet number in bytes
+type PacketNumberLen uint8
+
+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
+	// PacketNumberLen4 is a packet number length of 4 bytes
+	PacketNumberLen4 PacketNumberLen = 4
+	// PacketNumberLen6 is a packet number length of 6 bytes
+	PacketNumberLen6 PacketNumberLen = 6
+)
+
+// A ConnectionID in QUIC
+type ConnectionID uint64
+
+// A StreamID in QUIC
+type StreamID uint32
+
+// A ByteCount in QUIC
+type ByteCount uint64
+
+// MaxByteCount is the maximum value of a ByteCount
+const MaxByteCount = ByteCount(math.MaxUint64)
+
+// 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
+
+// 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
+
+// InitialStreamFlowControlWindow is the initial stream-level flow control window for sending
+const InitialStreamFlowControlWindow ByteCount = (1 << 14) // 16 kB
+
+// InitialConnectionFlowControlWindow is the initial connection-level flow control window for sending
+const InitialConnectionFlowControlWindow ByteCount = (1 << 14) // 16 kB
+
+// ClientHelloMinimumSize is the minimum size the server expects an inchoate CHLO to have.
+const ClientHelloMinimumSize = 1024
+
+// MaxClientHellos is the maximum number of times we'll send a client hello
+// The value 3 accounts for:
+// * one failure due to an incorrect or missing source-address token
+// * one failure due the server's certificate chain being unavailible and the server being unwilling to send it without a valid source-address token
+const MaxClientHellos = 3