feat: add option to bind listener to a (VRF) device

Signed-off-by: Milan Lenco <milan.lenco@pantheon.tech>

9 files changed, 164 insertions, 172 deletions

diff --git a/api/gobgp.pb.go b/api/gobgp.pb.go
index df97552b..7201ad7f 100644
--- a/api/gobgp.pb.go
+++ b/api/gobgp.pb.go
@@ -5314,6 +5314,7 @@ type Global struct {
 	Confederation         *Confederation               `protobuf:"bytes,9,opt,name=confederation" json:"confederation,omitempty"`
 	GracefulRestart       *GracefulRestart             `protobuf:"bytes,10,opt,name=graceful_restart,json=gracefulRestart" json:"graceful_restart,omitempty"`
 	ApplyPolicy           *ApplyPolicy                 `protobuf:"bytes,11,opt,name=apply_policy,json=applyPolicy" json:"apply_policy,omitempty"`
+	BindToDevice          string                       `protobuf:"bytes,12,opt,name=bind_to_device,json=bindToDevice" json:"bind_to_device,omitempty"`
 }
 
 func (m *Global) Reset()                    { *m = Global{} }
@@ -5398,6 +5399,13 @@ func (m *Global) GetApplyPolicy() *ApplyPolicy {
 	return nil
 }
 
+func (m *Global) GetBindToDevice() string {
+	if m != nil {
+		return m.BindToDevice
+	}
+	return ""
+}
+
 type Confederation struct {
 	Enabled      bool     `protobuf:"varint,1,opt,name=enabled" json:"enabled,omitempty"`
 	Identifier   uint32   `protobuf:"varint,2,opt,name=identifier" json:"identifier,omitempty"`
@@ -7897,14 +7905,14 @@ var _GobgpApi_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("gobgp.proto", fileDescriptor2) }
 
 var fileDescriptor2 = []byte{
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+	0x72, 0x67, 0xdb, 0xb9, 0x33, 0xae, 0x51, 0x22, 0xe1, 0x0c, 0xc3, 0x38, 0xff, 0x94, 0xe7, 0x14,
+	0xeb, 0x38, 0x93, 0x0e, 0x39, 0x26, 0x56, 0x9c, 0xe2, 0x6a, 0xc9, 0xa2, 0x65, 0xe1, 0x93, 0x4b,
+	0x51, 0xb5, 0x2c, 0xf1, 0x5d, 0x5e, 0xe0, 0x15, 0x54, 0x0c, 0x4b, 0xac, 0x8c, 0x2a, 0xb0, 0xd4,
+	0x6f, 0x76, 0xdb, 0x3b, 0xca, 0x1b, 0xf4, 0xe7, 0x93, 0xe6, 0x90, 0x9d, 0xe4, 0x2a, 0xb0, 0xd4,
+	0xc2, 0xb8, 0x87, 0x95, 0x3c, 0x2a, 0x43, 0xf1, 0x9b, 0x26, 0xee, 0x2a, 0x05, 0xf6, 0x42, 0xb5,
+	0xfb, 0xa4, 0xa7, 0x14, 0x29, 0x7a, 0xb7, 0xf5, 0xf8, 0x60, 0x4f, 0x59, 0xa2, 0x3f, 0x87, 0xb8,
+	0xb9, 0xd3, 0x52, 0x4a, 0xb7, 0x77, 0xa1, 0x12, 0x65, 0xf8, 0x43, 0x00, 0xa5, 0xbd, 0x4e, 0xef,
+	0x71, 0xb3, 0xc3, 0x19, 0xf3, 0x33, 0x1f, 0x7b, 0x72, 0xda, 0xdc, 0xfd, 0xa9, 0xd6, 0xee, 0x2a,
+	0x79, 0x96, 0xba, 0x61, 0xf7, 0xa7, 0x5a, 0xef, 0x60, 0xc8, 0x93, 0x52, 0x3c, 0xc7, 0x4f, 0x94,
+	0xe2, 0xed, 0x4e, 0xe2, 0xeb, 0x5b, 0xae, 0xa5, 0x91, 0x02, 0xb5, 0x4e, 0xaf, 0xf7, 0xec, 0xa0,
+	0xaf, 0xb5, 0x5e, 0x34, 0x77, 0x86, 0xca, 0x1b, 0x68, 0x15, 0xea, 0x02, 0xd2, 0xe9, 0x75, 0xf7,
+	0x5a, 0x98, 0x67, 0x68, 0x10, 0xa0, 0xc1, 0xd3, 0x1e, 0x1e, 0xb6, 0xb0, 0x92, 0xbf, 0xfd, 0xab,
+	0x1c, 0x54, 0xa5, 0xe0, 0x92, 0x94, 0x9d, 0xf2, 0x0d, 0x54, 0x83, 0x72, 0xb7, 0xd5, 0xde, 0x7b,
+	0xfa, 0xb8, 0x47, 0x6b, 0x2f, 0x43, 0x61, 0xd8, 0xdc, 0x13, 0xdd, 0x1a, 0x68, 0xfd, 0xe6, 0xf0,
+	0xa9, 0x52, 0x40, 0x75, 0xa8, 0xec, 0xf4, 0xf6, 0xf7, 0x0f, 0xba, 0xed, 0xe1, 0xb7, 0x4a, 0x91,
+	0xb6, 0xda, 0x7a, 0x31, 0xd4, 0x62, 0xd0, 0x12, 0x3d, 0x22, 0x77, 0x9a, 0x78, 0xaf, 0x25, 0x01,
+	0x4b, 0x9c, 0xf5, 0x8b, 0xa1, 0xf6, 0xb4, 0xd7, 0x57, 0x96, 0x6f, 0xbf, 0x07, 0x95, 0x28, 0x8c,
+	0xc4, 0x1e, 0xfc, 0x77, 0xbf, 0x95, 0x5f, 0xfe, 0x03, 0x94, 0xda, 0xdd, 0xe7, 0x2d, 0x3c, 0x54,
+	0xf2, 0xb7, 0x6f, 0x83, 0x92, 0x0e, 0x0c, 0xa1, 0x12, 0xe4, 0x5b, 0x5f, 0x2b, 0x6f, 0xd0, 0xbf,
+	0x7b, 0x2d, 0x25, 0x47, 0xff, 0x76, 0x5a, 0x4a, 0xfe, 0xf6, 0x87, 0xe2, 0x31, 0x98, 0x38, 0x6d,
+	0x25, 0x52, 0x70, 0x36, 0x77, 0x76, 0x5a, 0xfd, 0x21, 0x67, 0x8e, 0x5b, 0x3f, 0x65, 0x6f, 0x89,
+	0x6f, 0x1f, 0xc0, 0xda, 0x9c, 0x03, 0x34, 0x1d, 0x54, 0xd4, 0x77, 0xad, 0xb9, 0xbb, 0xab, 0xbc,
+	0x41, 0x0f, 0xec, 0x31, 0x08, 0xb7, 0xf6, 0x7b, 0xcf, 0x69, 0xc3, 0x97, 0x60, 0x55, 0x86, 0x8a,
+	0x8f, 0x15, 0x6e, 0x7f, 0x00, 0xf5, 0xc4, 0x41, 0x99, 0xce, 0xe0, 0x7e, 0x6b, 0x57, 0xdb, 0xef,
+	0x51, 0x56, 0x0d, 0xa8, 0xd2, 0x42, 0x48, 0x9e, 0xbb, 0xfd, 0x10, 0x1a, 0x29, 0x77, 0x3b, 0xf9,
+	0x10, 0x9a, 0x4e, 0xc7, 0x7e, 0xbf, 0x87, 0x45, 0xef, 0x5b, 0x2f, 0xd8, 0xef, 0xfc, 0x83, 0xdf,
+	0x5c, 0x85, 0xf2, 0x1e, 0x95, 0xef, 0xa6, 0x6b, 0xa2, 0xcf, 0xa1, 0x1c, 0x66, 0x6c, 0x47, 0x97,
+	0x13, 0x87, 0x04, 0x39, 0x8b, 0xfb, 0xf6, 0x46, 0x46, 0x2b, 0xb7, 0xa6, 0x6e, 0x70, 0x8a, 0x3e,
+	0x83, 0x65, 0x91, 0xb3, 0x1d, 0x6d, 0xc9, 0xb5, 0xe5, 0x34, 0xee, 0x67, 0x54, 0x2e, 0xf1, 0x6c,
+	0xee, 0x48, 0x32, 0xe7, 0x89, 0x84, 0xef, 0xdb, 0x5b, 0x59, 0x84, 0x50, 0x4f, 0x9f, 0xc1, 0xb2,
+	0xc8, 0xe5, 0x8c, 0x52, 0xc1, 0xde, 0x38, 0xbf, 0xf4, 0xc2, 0x96, 0x9b, 0x00, 0x71, 0xf6, 0x66,
+	0x74, 0x45, 0xf6, 0x4c, 0x52, 0xb9, 0xde, 0x17, 0xb2, 0xd8, 0x81, 0x72, 0x98, 0x72, 0x5d, 0x9e,
+	0xb8, 0x54, 0x7e, 0xf7, 0xed, 0xed, 0x79, 0x28, 0x3e, 0x84, 0x7b, 0x39, 0xb4, 0x07, 0x10, 0x27,
+	0x68, 0x96, 0xfb, 0x91, 0xc9, 0xca, 0xbe, 0xfd, 0xe6, 0x7c, 0xa4, 0x98, 0x8d, 0x2f, 0xa1, 0x12,
+	0x65, 0x27, 0x47, 0xdb, 0x8b, 0x53, 0x96, 0x2f, 0x1c, 0x4e, 0x0b, 0x6a, 0x72, 0xee, 0x71, 0x24,
+	0xc5, 0x8a, 0xe6, 0xe4, 0x24, 0x3f, 0x6b, 0x62, 0xe3, 0x5c, 0xe3, 0xf2, 0x80, 0x32, 0x19, 0xc8,
+	0xcf, 0x98, 0xd8, 0xaa, 0x94, 0x7f, 0x1c, 0x49, 0xe3, 0xce, 0xa6, 0x25, 0x5f, 0xc8, 0xa4, 0x03,
+	0x55, 0x29, 0x49, 0xb8, 0xcc, 0x24, 0x9b, 0x85, 0x7c, 0xfb, 0xea, 0x02, 0x6c, 0xb4, 0x4c, 0x2d,
+	0xa8, 0xc9, 0x79, 0xc3, 0xe5, 0xc9, 0x99, 0x93, 0x4f, 0x7c, 0x61, 0xa7, 0x9e, 0x41, 0x23, 0x95,
+	0x33, 0x1c, 0xdd, 0x98, 0x27, 0x7a, 0x17, 0x62, 0xf6, 0x1c, 0x1a, 0xa9, 0xdc, 0xde, 0x32, 0xb3,
+	0xf9, 0xd9, 0xc6, 0xb7, 0xdf, 0x3a, 0x83, 0x42, 0x48, 0xd2, 0xd7, 0x80, 0xb2, 0x99, 0xbe, 0xd1,
+	0x8f, 0x12, 0x23, 0x9e, 0x9f, 0x07, 0x7c, 0x61, 0x57, 0xbf, 0xe0, 0x5b, 0x55, 0x0f, 0x8e, 0x50,
+	0xf6, 0x5e, 0x26, 0xac, 0x7c, 0x79, 0x0e, 0x46, 0x74, 0x29, 0xde, 0xad, 0x94, 0x45, 0x76, 0xb7,
+	0x4a, 0x5c, 0xce, 0xdb, 0xad, 0x94, 0xc1, 0xe5, 0x85, 0xb9, 0xa2, 0x33, 0xbb, 0x55, 0xea, 0xc5,
+	0xbd, 0x1c, 0x6a, 0x47, 0xd7, 0x56, 0x3c, 0x6f, 0x32, 0xba, 0x96, 0xe9, 0x73, 0x22, 0xa1, 0xf2,
+	0xa2, 0xde, 0xdc, 0xca, 0xa1, 0x26, 0x94, 0xc3, 0x9c, 0xc3, 0x72, 0x7f, 0x52, 0xc9, 0x90, 0xe5,
+	0xfe, 0x64, 0x52, 0x14, 0xf7, 0xa0, 0x26, 0xa7, 0xdd, 0x45, 0x59, 0x29, 0x4e, 0xb0, 0xba, 0xb6,
+	0x08, 0x1d, 0x0d, 0xef, 0x27, 0x50, 0xe2, 0xb9, 0x78, 0x51, 0xf2, 0x32, 0x2c, 0x4e, 0xa1, 0xbb,
+	0x70, 0x7a, 0xbf, 0x84, 0x4a, 0x94, 0x94, 0x57, 0x56, 0x3f, 0xe9, 0x4c, 0xbd, 0x0b, 0x19, 0x7c,
+	0x05, 0xcb, 0x22, 0x0f, 0xaf, 0x2c, 0x22, 0xc9, 0x04, 0xbe, 0xdb, 0x97, 0xe7, 0x60, 0xa2, 0xde,
+	0x7f, 0x09, 0x95, 0x28, 0xcb, 0xa5, 0xdc, 0x85, 0x74, 0xaa, 0xde, 0xb3, 0x34, 0xa0, 0x9c, 0xcc,
+	0x52, 0x9e, 0xcf, 0x39, 0x39, 0x77, 0x17, 0xb2, 0x69, 0x03, 0xc4, 0x89, 0x23, 0x65, 0x61, 0xcd,
+	0x24, 0xcd, 0x95, 0x55, 0x7a, 0x36, 0x51, 0xee, 0xbd, 0x1c, 0xd5, 0x84, 0x52, 0xfe, 0x5b, 0x59,
+	0x89, 0x65, 0xd3, 0xe2, 0x2e, 0xec, 0xcf, 0x1e, 0x13, 0x5a, 0xe9, 0x0e, 0x31, 0x29, 0xb4, 0x99,
+	0x74, 0xaf, 0x0b, 0x19, 0xed, 0x87, 0x49, 0xce, 0x24, 0x5e, 0x6f, 0xa5, 0xe7, 0xe8, 0xe2, 0xec,
+	0x0e, 0x78, 0x7e, 0x66, 0x89, 0xd9, 0xf5, 0xe4, 0x74, 0x64, 0x59, 0xdd, 0x58, 0x4c, 0x90, 0x52,
+	0xd5, 0x71, 0x84, 0x36, 0xa9, 0xaa, 0xd3, 0xb9, 0x57, 0xcf, 0x57, 0xd5, 0x31, 0xa7, 0x8c, 0xaa,
+	0xbe, 0x30, 0x33, 0x0c, 0xf5, 0x44, 0x32, 0x57, 0x79, 0x09, 0xe6, 0x65, 0x84, 0xdd, 0xbe, 0xbe,
+	0x10, 0x1f, 0x8d, 0x73, 0xc0, 0xff, 0x95, 0x45, 0x3a, 0x62, 0xfb, 0xf6, 0x1c, 0xc1, 0xcf, 0xa4,
+	0x18, 0x5d, 0xd8, 0xd1, 0x6f, 0xa3, 0x7f, 0x6a, 0x91, 0xe6, 0x7b, 0x73, 0xfe, 0x66, 0xb8, 0x38,
+	0xeb, 0x09, 0x4f, 0x52, 0x99, 0x61, 0xfc, 0xce, 0xbc, 0x3d, 0x90, 0x65, 0xfb, 0xee, 0x79, 0x64,
+	0xf2, 0xc4, 0xcc, 0x49, 0xae, 0x2a, 0x4f, 0xcc, 0xe2, 0xdc, 0xab, 0x67, 0xb9, 0xb9, 0x22, 0xaf,
+	0x6a, 0xca, 0x82, 0x49, 0x99, 0x3c, 0xcf, 0x77, 0x36, 0x59, 0xfd, 0x8c, 0xf9, 0xba, 0x08, 0x0b,
+	0x61, 0xbe, 0x18, 0x83, 0x94, 0x16, 0x94, 0xab, 0x6f, 0xcf, 0x43, 0x45, 0x33, 0x13, 0xf9, 0x66,
+	0xe9, 0x7e, 0x64, 0x52, 0xa3, 0x5e, 0xc0, 0x37, 0x63, 0x3c, 0xb2, 0xbe, 0xd9, 0x45, 0x98, 0x84,
+	0xbe, 0x2a, 0x63, 0x91, 0xf6, 0x55, 0x2f, 0xc2, 0x40, 0xec, 0xa7, 0x28, 0x5d, 0x69, 0x7a, 0x3f,
+	0xa5, 0x33, 0xa1, 0xa6, 0xf7, 0x53, 0x26, 0xcf, 0x29, 0xd7, 0xb5, 0x52, 0x1e, 0x53, 0x79, 0x64,
+	0xd9, 0xf4, 0xa6, 0x67, 0x8d, 0x2c, 0x4a, 0xf3, 0x29, 0x8f, 0x2c, 0x9d, 0xfb, 0xf3, 0x4c, 0x51,
+	0x89, 0x12, 0x71, 0x26, 0x44, 0x25, 0x9d, 0x9e, 0x73, 0x21, 0x0b, 0x6e, 0xc5, 0x1f, 0x4f, 0xdd,
+	0x94, 0x15, 0x8f, 0x53, 0x53, 0x9e, 0x6f, 0xc5, 0x69, 0xed, 0x8c, 0x15, 0xbf, 0x00, 0x03, 0x6e,
+	0xb0, 0xc2, 0x78, 0x49, 0xca, 0x60, 0xa5, 0xc2, 0x28, 0x8b, 0x98, 0x1c, 0x96, 0x58, 0xf9, 0xa3,
+	0xff, 0x1f, 0x00, 0x00, 0xff, 0xff, 0x12, 0xa5, 0x7c, 0xf0, 0xbc, 0x6c, 0x00, 0x00,
 }
diff --git a/api/gobgp.proto b/api/gobgp.proto
index 655fdf8f..3b9f18e9 100644
--- a/api/gobgp.proto
+++ b/api/gobgp.proto
@@ -1006,6 +1006,7 @@ message Global {
   Confederation confederation = 9;
   GracefulRestart graceful_restart = 10;
   ApplyPolicy apply_policy = 11;
+  string bind_to_device = 12;
 }
 
 message Confederation {
diff --git a/pkg/server/server.go b/pkg/server/server.go
index d9a65c0f..c5b2b0ff 100644
--- a/pkg/server/server.go
+++ b/pkg/server/server.go
@@ -23,6 +23,7 @@ import (
 	"reflect"
 	"strconv"
 	"sync"
+	"syscall"
 	"time"
 
 	"github.com/eapache/channels"
@@ -52,35 +53,56 @@ func (l *tcpListener) Close() error {
 }
 
 // avoid mapped IPv6 address
-func newTCPListener(address string, port uint32, ch chan *net.TCPConn) (*tcpListener, error) {
+func newTCPListener(address string, port uint32, bindToDev string, ch chan *net.TCPConn) (*tcpListener, error) {
 	proto := "tcp4"
+	family := syscall.AF_INET
 	if ip := net.ParseIP(address); ip == nil {
 		return nil, fmt.Errorf("can't listen on %s", address)
 	} else if ip.To4() == nil {
 		proto = "tcp6"
+		family = syscall.AF_INET6
 	}
-	addr, err := net.ResolveTCPAddr(proto, net.JoinHostPort(address, strconv.Itoa(int(port))))
-	if err != nil {
-		return nil, err
+	addr := net.JoinHostPort(address, strconv.Itoa(int(port)))
+
+	var lc net.ListenConfig
+	lc.Control = func(network, address string, c syscall.RawConn) error {
+		if bindToDev != "" {
+			err := setBindToDevSockopt(c, bindToDev)
+			if err != nil {
+				log.WithFields(log.Fields{
+					"Topic":     "Peer",
+					"Key":       addr,
+					"BindToDev": bindToDev,
+				}).Warnf("failed to bind Listener to device (%s): %s", bindToDev, err)
+				return err
+			}
+		}
+		// Note: Set TTL=255 for incoming connection listener in order to accept
+		// connection in case for the neighbor has TTL Security settings.
+		err := setsockoptIpTtl(c, family, 255)
+		if err != nil {
+			log.WithFields(log.Fields{
+				"Topic": "Peer",
+				"Key":   addr,
+			}).Warnf("cannot set TTL(=%d) for TCPListener: %s", 255, err)
+		}
+		return nil
 	}
 
-	l, err := net.ListenTCP(proto, addr)
+	l, err := lc.Listen(context.Background(), proto, addr)
 	if err != nil {
 		return nil, err
 	}
-	// Note: Set TTL=255 for incoming connection listener in order to accept
-	// connection in case for the neighbor has TTL Security settings.
-	if err := setListenTCPTTLSockopt(l, 255); err != nil {
-		log.WithFields(log.Fields{
-			"Topic": "Peer",
-			"Key":   addr,
-		}).Warnf("cannot set TTL(=%d) for TCPListener: %s", 255, err)
+	listener, ok := l.(*net.TCPListener)
+	if !ok {
+		err = fmt.Errorf("unexpected connection listener (not for TCP)")
+		return nil, err
 	}
 
 	closeCh := make(chan struct{})
 	go func() error {
 		for {
-			conn, err := l.AcceptTCP()
+			conn, err := listener.AcceptTCP()
 			if err != nil {
 				close(closeCh)
 				log.WithFields(log.Fields{
@@ -93,7 +115,7 @@ func newTCPListener(address string, port uint32, ch chan *net.TCPConn) (*tcpList
 		}
 	}()
 	return &tcpListener{
-		l:  l,
+		l:  listener,
 		ch: closeCh,
 	}, nil
 }
@@ -2101,7 +2123,7 @@ func (s *BgpServer) StartBgp(ctx context.Context, r *api.StartBgpRequest) error
 		if c.Config.Port > 0 {
 			acceptCh := make(chan *net.TCPConn, 4096)
 			for _, addr := range c.Config.LocalAddressList {
-				l, err := newTCPListener(addr, uint32(c.Config.Port), acceptCh)
+				l, err := newTCPListener(addr, uint32(c.Config.Port), g.BindToDevice, acceptCh)
 				if err != nil {
 					return err
 				}
diff --git a/pkg/server/sockopt.go b/pkg/server/sockopt.go
index 0aab0ba9..235bbbb9 100644
--- a/pkg/server/sockopt.go
+++ b/pkg/server/sockopt.go
@@ -17,6 +17,7 @@
 package server
 
 import (
+	"fmt"
 	"net"
 	"syscall"
 
@@ -27,10 +28,6 @@ func setTCPMD5SigSockopt(l *net.TCPListener, address string, key string) error {
 	return setTcpMD5SigSockopt(l, address, key)
 }
 
-func setListenTCPTTLSockopt(l *net.TCPListener, ttl int) error {
-	return setListenTcpTTLSockopt(l, ttl)
-}
-
 func setTCPTTLSockopt(conn *net.TCPConn, ttl int) error {
 	return setTcpTTLSockopt(conn, ttl)
 }
@@ -39,6 +36,10 @@ func setTCPMinTTLSockopt(conn *net.TCPConn, ttl int) error {
 	return setTcpMinTTLSockopt(conn, ttl)
 }
 
+func setBindToDevSockopt(sc syscall.RawConn, device string) error {
+	return fmt.Errorf("binding connection to a device is not supported")
+}
+
 func dialerControl(network, address string, c syscall.RawConn, ttl, ttlMin uint8, password string, bindInterface string) error {
 	if password != "" {
 		log.WithFields(log.Fields{
diff --git a/pkg/server/sockopt_bsd.go b/pkg/server/sockopt_bsd.go
index fe7a6134..942e1289 100644
--- a/pkg/server/sockopt_bsd.go
+++ b/pkg/server/sockopt_bsd.go
@@ -35,15 +35,6 @@ func setTcpMD5SigSockopt(l *net.TCPListener, address string, key string) error {
 	return setsockOptInt(sc, syscall.IPPROTO_TCP, tcpMD5SIG, 1)
 }
 
-func setListenTcpTTLSockopt(l *net.TCPListener, ttl int) error {
-	family := extractFamilyFromTCPListener(l)
-	sc, err := l.SyscallConn()
-	if err != nil {
-		return err
-	}
-	return setsockoptIpTtl(sc, family, ttl)
-}
-
 func setTcpTTLSockopt(conn *net.TCPConn, ttl int) error {
 	family := extractFamilyFromTCPConn(conn)
 	sc, err := conn.SyscallConn()
diff --git a/pkg/server/sockopt_darwin.go b/pkg/server/sockopt_darwin.go
index abb69d35..30220952 100644
--- a/pkg/server/sockopt_darwin.go
+++ b/pkg/server/sockopt_darwin.go
@@ -27,15 +27,6 @@ func setTcpMD5SigSockopt(l *net.TCPListener, address string, key string) error {
 	return fmt.Errorf("setting md5 is not supported")
 }
 
-func setListenTcpTTLSockopt(l *net.TCPListener, ttl int) error {
-	family := extractFamilyFromTCPListener(l)
-	sc, err := l.SyscallConn()
-	if err != nil {
-		return err
-	}
-	return setsockoptIpTtl(sc, family, ttl)
-}
-
 func setTcpTTLSockopt(conn *net.TCPConn, ttl int) error {
 	family := syscall.AF_INET
 	if strings.Contains(conn.RemoteAddr().String(), "[") {
diff --git a/pkg/server/sockopt_linux.go b/pkg/server/sockopt_linux.go
index 203087ab..55d27bd4 100644
--- a/pkg/server/sockopt_linux.go
+++ b/pkg/server/sockopt_linux.go
@@ -70,13 +70,8 @@ func setTCPMD5SigSockopt(l *net.TCPListener, address string, key string) error {
 	return setsockOptString(sc, syscall.IPPROTO_TCP, tcpMD5SIG, string(b[:]))
 }
 
-func setListenTCPTTLSockopt(l *net.TCPListener, ttl int) error {
-	family := extractFamilyFromTCPListener(l)
-	sc, err := l.SyscallConn()
-	if err != nil {
-		return err
-	}
-	return setsockoptIpTtl(sc, family, ttl)
+func setBindToDevSockopt(sc syscall.RawConn, device string) error {
+	return setsockOptString(sc, syscall.SOL_SOCKET, syscall.SO_BINDTODEVICE, device)
 }
 
 func setTCPTTLSockopt(conn *net.TCPConn, ttl int) error {
@@ -162,14 +157,9 @@ func dialerControl(network, address string, c syscall.RawConn, ttl, minTtl uint8
 		}
 	}
 	if bindInterface != "" {
-		if err := c.Control(func(fd uintptr) {
-			sockerr = os.NewSyscallError("setsockopt", syscall.SetsockoptString(int(fd), syscall.SOL_SOCKET, syscall.SO_BINDTODEVICE, bindInterface))
-		}); err != nil {
+		if err := setBindToDevSockopt(c, bindInterface); err != nil {
 			return err
 		}
-		if sockerr != nil {
-			return sockerr
-		}
 	}
 	return nil
 }
diff --git a/pkg/server/sockopt_openbsd.go b/pkg/server/sockopt_openbsd.go
index 3d6825e2..612047ca 100644
--- a/pkg/server/sockopt_openbsd.go
+++ b/pkg/server/sockopt_openbsd.go
@@ -370,15 +370,6 @@ func setTCPMD5SigSockopt(l *net.TCPListener, address string, key string) error {
 	return setsockoptTcpMD5Sig(sc, address, key)
 }
 
-func setListenTCPTTLSockopt(l *net.TCPListener, ttl int) error {
-	family := extractFamilyFromTCPListener(l)
-	sc, err := l.SyscallConn()
-	if err != nil {
-		return err
-	}
-	return setsockoptIpTtl(sc, family, ttl)
-}
-
 func setTCPTTLSockopt(conn *net.TCPConn, ttl int) error {
 	family := extractFamilyFromTCPConn(conn)
 	sc, err := conn.SyscallConn()
@@ -403,6 +394,10 @@ func setTCPMinTTLSockopt(conn *net.TCPConn, ttl int) error {
 	return setsockOptInt(sc, level, name, ttl)
 }
 
+func setBindToDevSockopt(sc syscall.RawConn, device string) error {
+	return fmt.Errorf("binding connection to a device is not supported")
+}
+
 func dialerControl(network, address string, c syscall.RawConn, ttl, minTtl uint8, password string, bindInterface string) error {
 	if password != "" {
 		log.WithFields(log.Fields{
diff --git a/pkg/server/util.go b/pkg/server/util.go
index c774c6dd..e4abbed0 100644
--- a/pkg/server/util.go
+++ b/pkg/server/util.go
@@ -65,14 +65,6 @@ func decodeAdministrativeCommunication(data []byte) (string, []byte) {
 	return string(data[1 : communicationLen+1]), data[communicationLen+1:]
 }
 
-func extractFamilyFromTCPListener(l *net.TCPListener) int {
-	family := syscall.AF_INET
-	if strings.Contains(l.Addr().String(), "[") {
-		family = syscall.AF_INET6
-	}
-	return family
-}
-
 func extractFamilyFromTCPConn(conn *net.TCPConn) int {
 	family := syscall.AF_INET
 	if strings.Contains(conn.RemoteAddr().String(), "[") {