use shutdown

interface.go

@@ -505,20 +505,12 @@ func (f *Interface) Close() error {
 			f.l.WithError(err).Error("Error while closing udp socket")
 		}
 	}
-	for i, r := range f.readers {
-		if i == 0 {
-			continue // f.readers[0] is f.inside, which we want to save for last
-		}
-		if err := r.Close(); err != nil {
-			f.l.WithError(err).Error("Error while closing tun reader")
-		}
-	}
 
 	// Release the tun readers
-	for _, u := range f.readers {
+	for i, u := range f.readers {
 		err := u.Close()
 		if err != nil {
-			f.l.WithError(err).Error("Error while closing tun device")
+			f.l.WithError(err).WithField("i", i).Error("Error while closing tun device")
 		}
 	}
 

udp/udp_linux.go

@@ -9,7 +9,6 @@ import (
 	"net"
 	"net/netip"
 	"syscall"
-	"time"
 	"unsafe"
 
 	"github.com/rcrowley/go-metrics"
@@ -18,8 +17,6 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-var readTimeout = unix.NsecToTimeval(int64(time.Millisecond * 500))
-
 type StdConn struct {
 	sysFd int
 	isV4  bool
@@ -50,11 +47,6 @@ func NewListener(l *logrus.Logger, ip netip.Addr, port int, multi bool, batch in
 		}
 	}
 
-	// Set a read timeout
-	if err = unix.SetsockoptTimeval(fd, unix.SOL_SOCKET, unix.SO_RCVTIMEO, &readTimeout); err != nil {
-		return nil, fmt.Errorf("unable to set SO_RCVTIMEO: %s", err)
-	}
-
 	var sa unix.Sockaddr
 	if ip.Is4() {
 		sa4 := &unix.SockaddrInet4{Port: port}
@@ -162,9 +154,6 @@ func (u *StdConn) ReadSingle(msgs []rawMessage) (int, error) {
 		)
 
 		if err != 0 {
-			if err == unix.EAGAIN || err == unix.EINTR {
-				continue
-			}
 			return 0, &net.OpError{Op: "recvmsg", Err: err}
 		}
 
@@ -186,9 +175,6 @@ func (u *StdConn) ReadMulti(msgs []rawMessage) (int, error) {
 		)
 
 		if err != 0 {
-			if err == unix.EAGAIN || err == unix.EINTR {
-				continue
-			}
 			return 0, &net.OpError{Op: "recvmmsg", Err: err}
 		}
 
@@ -315,6 +301,7 @@ func (u *StdConn) getMemInfo(meminfo *[unix.SK_MEMINFO_VARS]uint32) error {
 }
 
 func (u *StdConn) Close() error {
+	_ = syscall.Shutdown(u.sysFd, syscall.SHUT_RDWR)
 	return syscall.Close(u.sysFd)
 }