Improve read wait interface &

Refactor Authenticator interface to struct &
Update smux &
Update gVisor to 20231204.0 &
Update wireguard-go &
Add GSO support for TUN/WireGuard &
Fix router pre-start &
Fix bind forwarder to interface for systems stack

transport/trojan/protocol_wait.go

@@ -0,0 +1,45 @@
+package trojan
+
+import (
+	"encoding/binary"
+
+	"github.com/sagernet/sing/common/buf"
+	E "github.com/sagernet/sing/common/exceptions"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/common/rw"
+)
+
+var _ N.PacketReadWaiter = (*ClientPacketConn)(nil)
+
+func (c *ClientPacketConn) InitializeReadWaiter(options N.ReadWaitOptions) (needCopy bool) {
+	c.readWaitOptions = options
+	return false
+}
+
+func (c *ClientPacketConn) WaitReadPacket() (buffer *buf.Buffer, destination M.Socksaddr, err error) {
+	destination, err = M.SocksaddrSerializer.ReadAddrPort(c.Conn)
+	if err != nil {
+		return nil, M.Socksaddr{}, E.Cause(err, "read destination")
+	}
+
+	var length uint16
+	err = binary.Read(c.Conn, binary.BigEndian, &length)
+	if err != nil {
+		return nil, M.Socksaddr{}, E.Cause(err, "read chunk length")
+	}
+
+	err = rw.SkipN(c.Conn, 2)
+	if err != nil {
+		return nil, M.Socksaddr{}, E.Cause(err, "skip crlf")
+	}
+
+	buffer = c.readWaitOptions.NewPacketBuffer()
+	_, err = buffer.ReadFullFrom(c.Conn, int(length))
+	if err != nil {
+		buffer.Release()
+		return
+	}
+	c.readWaitOptions.PostReturn(buffer)
+	return
+}