Add sockopt interface setting for binding outbound to a particular device like "eth0" (#1494)

* Update sockopt_linux.go

add Interface Name

* Update config.pb.go

add Interface Name

* Update transport_internet.go

add Interface Name

* Update config.pb.go

* update config.proto add interface

* Update config.pb.go

infra/conf/transport_internet.go

@@ -534,6 +534,7 @@ type SocketConfig struct {
 	TCPKeepAliveInterval int32       `json:"tcpKeepAliveInterval"`
 	TCPKeepAliveIdle     int32       `json:"tcpKeepAliveIdle"`
 	TCPCongestion        string      `json:"tcpCongestion"`
+	Interface            string      `json:"interface"`
 }
 
 // Build implements Buildable.
@@ -583,6 +584,7 @@ func (c *SocketConfig) Build() (*internet.SocketConfig, error) {
 		TcpKeepAliveInterval: c.TCPKeepAliveInterval,
 		TcpKeepAliveIdle:     c.TCPKeepAliveIdle,
 		TcpCongestion:        c.TCPCongestion,
+		Interface:            c.Interface,
 	}, nil
 }
 

transport/internet/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
-// 	protoc        v3.18.0
+// 	protoc        v3.21.9
 // source: transport/internet/config.proto
 
 package internet
@@ -425,6 +425,7 @@ type SocketConfig struct {
 	TcpKeepAliveInterval       int32          `protobuf:"varint,10,opt,name=tcp_keep_alive_interval,json=tcpKeepAliveInterval,proto3" json:"tcp_keep_alive_interval,omitempty"`
 	TcpKeepAliveIdle           int32          `protobuf:"varint,11,opt,name=tcp_keep_alive_idle,json=tcpKeepAliveIdle,proto3" json:"tcp_keep_alive_idle,omitempty"`
 	TcpCongestion              string         `protobuf:"bytes,12,opt,name=tcp_congestion,json=tcpCongestion,proto3" json:"tcp_congestion,omitempty"`
+	Interface                  string         `protobuf:"bytes,13,opt,name=interface,proto3" json:"interface,omitempty"`
 }
 
 func (x *SocketConfig) Reset() {
@@ -543,6 +544,13 @@ func (x *SocketConfig) GetTcpCongestion() string {
 	return ""
 }
 
+func (x *SocketConfig) GetInterface() string {
+	if x != nil {
+		return x.Interface
+	}
+	return ""
+}
+
 var File_transport_internet_config_proto protoreflect.FileDescriptor
 
 var file_transport_internet_config_proto_rawDesc = []byte{
@@ -595,7 +603,7 @@ var file_transport_internet_config_proto_rawDesc = []byte{
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@@ -630,27 +638,29 @@ var file_transport_internet_config_proto_rawDesc = []byte{
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 }
 
 var (

transport/internet/config.proto

@@ -98,4 +98,6 @@ message SocketConfig {
   int32 tcp_keep_alive_idle = 11;
   
   string tcp_congestion = 12;
+  
+  string interface = 13;
 }

transport/internet/sockopt_linux.go

@@ -46,6 +46,12 @@ func applyOutboundSocketOptions(network string, address string, fd uintptr, conf
 			return newError("failed to set SO_MARK").Base(err)
 		}
 	}
+	
+	if  config.Interface != "" {
+                if err := syscall.BindToDevice(int(fd), config.Interface); err != nil {
+                        return newError("failed to set Interface").Base(err)
+                }
+        }
 
 	if isTCPSocket(network) {
 		tfo := config.ParseTFOValue()