Export std net bind

conn/controlfns.go

@@ -6,8 +6,7 @@
 package conn
 
 import (
-	"net"
-	"syscall"
+	"github.com/sagernet/sing/common/control"
 )
 
 // UDP socket read/write buffer size (7MB). The value of 7MB is chosen as it is
@@ -17,27 +16,6 @@ import (
 // around this limitation)
 const socketBufferSize = 7 << 20
 
-// controlFn is the callback function signature from net.ListenConfig.Control.
-// It is used to apply platform specific configuration to the socket prior to
-// bind.
-type controlFn func(network, address string, c syscall.RawConn) error
-
 // controlFns is a list of functions that are called from the listen config
 // that can apply socket options.
-var controlFns = []controlFn{}
-
-// listenConfig returns a net.ListenConfig that applies the controlFns to the
-// socket prior to bind. This is used to apply socket buffer sizing and packet
-// information OOB configuration for sticky sockets.
-func listenConfig() *net.ListenConfig {
-	return &net.ListenConfig{
-		Control: func(network, address string, c syscall.RawConn) error {
-			for _, fn := range controlFns {
-				if err := fn(network, address, c); err != nil {
-					return err
-				}
-			}
-			return nil
-		},
-	}
-}
+var controlFns []control.Func