Refactor: autonomize core package

core/stack/handler.go

@@ -1,10 +0,0 @@
-package stack
-
-import (
-	"github.com/xjasonlyu/tun2socks/common/adapter"
-)
-
-type Handler interface {
-	Add(adapter.TCPConn)
-	AddPacket(adapter.UDPPacket)
-}

core/stack/stack.go

@@ -2,6 +2,8 @@
 package stack
 
 import (
+	"github.com/xjasonlyu/tun2socks/core"
+
 	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
 	"gvisor.dev/gvisor/pkg/tcpip/network/ipv6"
@@ -14,12 +16,12 @@ import (
 type Stack struct {
 	*stack.Stack
 
-	handler Handler
+	handler core.Handler
 	nicID   tcpip.NICID
 }
 
 // New allocates a new *Stack with given options.
-func New(ep stack.LinkEndpoint, handler Handler, opts ...Option) (*Stack, error) {
+func New(ep stack.LinkEndpoint, handler core.Handler, opts ...Option) (*Stack, error) {
 	s := &Stack{
 		Stack: stack.New(stack.Options{
 			NetworkProtocols: []stack.NetworkProtocolFactory{

core/stack/tcp.go

@@ -5,10 +5,9 @@ import (
 	"net"
 	"time"
 
-	"github.com/xjasonlyu/tun2socks/common/adapter"
-
 	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
 	"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
 	"gvisor.dev/gvisor/pkg/waiter"
 )
@@ -50,15 +49,8 @@ func withTCPHandler() Option {
 
 			conn := &tcpConn{
 				Conn: gonet.NewTCPConn(&wq, ep),
-				metadata: &adapter.Metadata{
-					Net:     adapter.TCP,
-					SrcIP:   net.IP(id.RemoteAddress),
-					SrcPort: id.RemotePort,
-					DstIP:   net.IP(id.LocalAddress),
-					DstPort: id.LocalPort,
-				},
+				id:   &id,
 			}
-
 			s.handler.Add(conn)
 		})
 		s.SetTransportProtocolHandler(tcp.ProtocolNumber, tcpForwarder.HandlePacket)
@@ -83,9 +75,9 @@ func setKeepalive(ep tcpip.Endpoint) error {
 
 type tcpConn struct {
 	net.Conn
-	metadata *adapter.Metadata
+	id *stack.TransportEndpointID
 }
 
-func (c *tcpConn) Metadata() *adapter.Metadata {
-	return c.metadata
+func (c *tcpConn) ID() *stack.TransportEndpointID {
+	return c.id
 }

core/stack/udp.go

@@ -4,8 +4,6 @@ import (
 	"fmt"
 	"net"
 
-	"github.com/xjasonlyu/tun2socks/common/adapter"
-
 	"gvisor.dev/gvisor/pkg/tcpip"
 	"gvisor.dev/gvisor/pkg/tcpip/buffer"
 	"gvisor.dev/gvisor/pkg/tcpip/header"
@@ -39,18 +37,11 @@ func withUDPHandler() Option {
 
 			packet := &udpPacket{
 				s:        s,
-				id:       id,
+				id:       &id,
 				nicID:    pkt.NICID,
 				netHdr:   pkt.Network(),
 				netProto: pkt.NetworkProtocolNumber,
 				payload:  pkt.Data.ToView(),
-				metadata: &adapter.Metadata{
-					Net:     adapter.UDP,
-					SrcIP:   net.IP(id.RemoteAddress),
-					SrcPort: id.RemotePort,
-					DstIP:   net.IP(id.LocalAddress),
-					DstPort: id.LocalPort,
-				},
 			}
 
 			s.handler.AddPacket(packet)
@@ -63,12 +54,11 @@ func withUDPHandler() Option {
 
 type udpPacket struct {
 	s        *Stack
-	id       stack.TransportEndpointID
+	id       *stack.TransportEndpointID
 	nicID    tcpip.NICID
 	netHdr   header.Network
 	netProto tcpip.NetworkProtocolNumber
 	payload  []byte
-	metadata *adapter.Metadata
 }
 
 func (p *udpPacket) Data() []byte {
@@ -79,12 +69,12 @@ func (p *udpPacket) Drop() {
 	/* Release */
 }
 
-func (p *udpPacket) LocalAddr() net.Addr {
-	return &net.UDPAddr{IP: net.IP(p.id.LocalAddress), Port: int(p.id.LocalPort)}
+func (p *udpPacket) ID() *stack.TransportEndpointID {
+	return p.id
 }
 
-func (p *udpPacket) Metadata() *adapter.Metadata {
-	return p.metadata
+func (p *udpPacket) LocalAddr() net.Addr {
+	return &net.UDPAddr{IP: net.IP(p.id.LocalAddress), Port: int(p.id.LocalPort)}
 }
 
 func (p *udpPacket) RemoteAddr() net.Addr {