feat: introduce a new robust approach to handle tproxy udp. (#389)

listener/tunnel/packet.go

@@ -4,6 +4,7 @@ import (
 	"net"
 
 	"github.com/Dreamacro/clash/common/pool"
+	C "github.com/Dreamacro/clash/constant"
 )
 
 type packet struct {
@@ -33,3 +34,11 @@ func (c *packet) Drop() {
 func (c *packet) InAddr() net.Addr {
 	return c.pc.LocalAddr()
 }
+
+func (c *packet) SetNatTable(natTable C.NatTable) {
+	// no need
+}
+
+func (c *packet) SetUdpInChan(in chan<- C.PacketAdapter) {
+	// no need
+}