Add TCP MultiPath support

transport/dhcp/server.go

@@ -248,10 +248,10 @@ func (t *Transport) recreateServers(iface *net.Interface, serverAddrs []netip.Ad
 		}), ","), "]")
 	}
 
-	serverDialer := dialer.NewDefault(t.router, option.DialerOptions{
+	serverDialer := common.Must1(dialer.NewDefault(t.router, option.DialerOptions{
 		BindInterface:      iface.Name,
 		UDPFragmentDefault: true,
-	})
+	}))
 	var transports []dns.Transport
 	for _, serverAddr := range serverAddrs {
 		serverTransport, err := dns.NewUDPTransport(t.name, t.ctx, serverDialer, M.Socksaddr{Addr: serverAddr, Port: 53})

transport/wireguard/device_system.go

@@ -10,6 +10,7 @@ import (
 	"github.com/sagernet/sing-box/common/dialer"
 	"github.com/sagernet/sing-box/option"
 	"github.com/sagernet/sing-tun"
+	"github.com/sagernet/sing/common"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
 	wgTun "github.com/sagernet/wireguard-go/tun"
@@ -58,9 +59,9 @@ func NewSystemDevice(router adapter.Router, interfaceName string, localPrefixes
 		inet6Address = inet6Addresses[0].Addr()
 	}
 	return &SystemDevice{
-		dialer: dialer.NewDefault(router, option.DialerOptions{
+		dialer: common.Must1(dialer.NewDefault(router, option.DialerOptions{
 			BindInterface: interfaceName,
-		}),
+		})),
 		device: tunInterface,
 		name:   interfaceName,
 		mtu:    int(mtu),