Add Snell protocol. Refactor MASQUE HTTP/2, Fair Queue. Update XHTTP, OpenVPN, Sudoku, Fallback. Fixes

common/congestion/congestion.go

@@ -0,0 +1,77 @@
+package congestion
+
+import (
+	"time"
+
+	"github.com/sagernet/quic-go"
+	"github.com/sagernet/quic-go/congestion"
+	"github.com/sagernet/sing-quic/congestion_bbr1"
+	"github.com/sagernet/sing-quic/congestion_bbr2"
+	congestion_meta1 "github.com/sagernet/sing-quic/congestion_meta1"
+	congestion_meta2 "github.com/sagernet/sing-quic/congestion_meta2"
+	E "github.com/sagernet/sing/common/exceptions"
+)
+
+func NewCongestionControl(name string, cwnd int, timeFunc func() time.Time) (func(conn *quic.Conn) congestion.CongestionControl, error) {
+	if timeFunc == nil {
+		timeFunc = time.Now
+	}
+	if cwnd == 0 {
+		cwnd = 32
+	}
+	switch name {
+	case "", "bbr":
+		return func(conn *quic.Conn) congestion.CongestionControl {
+			return congestion_meta2.NewBbrSender(
+				congestion_meta2.DefaultClock{TimeFunc: timeFunc},
+				congestion.ByteCount(conn.Config().InitialPacketSize),
+				congestion.ByteCount(cwnd)*congestion.ByteCount(conn.Config().InitialPacketSize),
+			)
+		}, nil
+	case "bbr_standard":
+		return func(conn *quic.Conn) congestion.CongestionControl {
+			return congestion_bbr1.NewBbrSender(
+				congestion_bbr1.DefaultClock{TimeFunc: timeFunc},
+				congestion.ByteCount(conn.Config().InitialPacketSize),
+				congestion_bbr1.InitialCongestionWindowPackets,
+				congestion_bbr1.MaxCongestionWindowPackets,
+			)
+		}, nil
+	case "bbr2":
+		return func(conn *quic.Conn) congestion.CongestionControl {
+			return congestion_bbr2.NewBBR2Sender(
+				congestion_bbr2.DefaultClock{TimeFunc: timeFunc},
+				congestion.ByteCount(conn.Config().InitialPacketSize),
+				0,
+				false,
+			)
+		}, nil
+	case "bbr2_variant":
+		return func(conn *quic.Conn) congestion.CongestionControl {
+			return congestion_bbr2.NewBBR2Sender(
+				congestion_bbr2.DefaultClock{TimeFunc: timeFunc},
+				congestion.ByteCount(conn.Config().InitialPacketSize),
+				32*congestion.ByteCount(conn.Config().InitialPacketSize),
+				true,
+			)
+		}, nil
+	case "cubic":
+		return func(conn *quic.Conn) congestion.CongestionControl {
+			return congestion_meta1.NewCubicSender(
+				congestion_meta1.DefaultClock{TimeFunc: timeFunc},
+				congestion.ByteCount(conn.Config().InitialPacketSize),
+				false,
+			)
+		}, nil
+	case "reno":
+		return func(conn *quic.Conn) congestion.CongestionControl {
+			return congestion_meta1.NewCubicSender(
+				congestion_meta1.DefaultClock{TimeFunc: timeFunc},
+				congestion.ByteCount(conn.Config().InitialPacketSize),
+				true,
+			)
+		}, nil
+	default:
+		return nil, E.New("unknown congestion control: ", name)
+	}
+}