Add tcpKeepAliveInterval in transport sockopt (#754)

Co-authored-by: Ahmad Karimi <[email protected]>
Co-authored-by: Shelikhoo <[email protected]>

infra/conf/transport_internet.go

@@ -489,6 +489,8 @@ type SocketConfig struct {
 	AcceptProxyProtocol bool        `json:"acceptProxyProtocol"`
 	DomainStrategy      string      `json:"domainStrategy"`
 	DialerProxy         string      `json:"dialerProxy"`
+
+	TCPKeepAliveInterval int32 `json:"tcpKeepAliveInterval"`
 }
 
 // Build implements Buildable.
@@ -529,12 +531,13 @@ func (c *SocketConfig) Build() (*internet.SocketConfig, error) {
 	}
 
 	return &internet.SocketConfig{
-		Mark:                c.Mark,
-		Tfo:                 tfo,
-		Tproxy:              tproxy,
-		DomainStrategy:      dStrategy,
-		AcceptProxyProtocol: c.AcceptProxyProtocol,
-		DialerProxy:         c.DialerProxy,
+		Mark:                 c.Mark,
+		Tfo:                  tfo,
+		Tproxy:               tproxy,
+		DomainStrategy:       dStrategy,
+		AcceptProxyProtocol:  c.AcceptProxyProtocol,
+		DialerProxy:          c.DialerProxy,
+		TcpKeepAliveInterval: c.TCPKeepAliveInterval,
 	}, nil
 }
 

transport/internet/config.pb.go

@@ -422,6 +422,7 @@ type SocketConfig struct {
 	AcceptProxyProtocol        bool           `protobuf:"varint,7,opt,name=accept_proxy_protocol,json=acceptProxyProtocol,proto3" json:"accept_proxy_protocol,omitempty"`
 	DomainStrategy             DomainStrategy `protobuf:"varint,8,opt,name=domain_strategy,json=domainStrategy,proto3,enum=xray.transport.internet.DomainStrategy" json:"domain_strategy,omitempty"`
 	DialerProxy                string         `protobuf:"bytes,9,opt,name=dialer_proxy,json=dialerProxy,proto3" json:"dialer_proxy,omitempty"`
+	TcpKeepAliveInterval       int32          `protobuf:"varint,10,opt,name=tcp_keep_alive_interval,json=tcpKeepAliveInterval,proto3" json:"tcp_keep_alive_interval,omitempty"`
 }
 
 func (x *SocketConfig) Reset() {
@@ -519,6 +520,13 @@ func (x *SocketConfig) GetDialerProxy() string {
 	return ""
 }
 
+func (x *SocketConfig) GetTcpKeepAliveInterval() int32 {
+	if x != nil {
+		return x.TcpKeepAliveInterval
+	}
+	return 0
+}
+
 var File_transport_internet_config_proto protoreflect.FileDescriptor
 
 var file_transport_internet_config_proto_rawDesc = []byte{
@@ -571,7 +579,7 @@ var file_transport_internet_config_proto_rawDesc = []byte{
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@@ -597,27 +605,31 @@ var file_transport_internet_config_proto_rawDesc = []byte{
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 }
 
 var (

transport/internet/config.proto

@@ -90,5 +90,8 @@ message SocketConfig {
   bool accept_proxy_protocol = 7;
 
   DomainStrategy domain_strategy = 8;
+
   string dialer_proxy = 9;
+
+  int32 tcp_keep_alive_interval = 10;
 }

transport/internet/sockopt_linux.go

@@ -57,6 +57,12 @@ func applyOutboundSocketOptions(network string, address string, fd uintptr, conf
 				return newError("failed to set TCP_FASTOPEN_CONNECT=", tfo).Base(err)
 			}
 		}
+
+		if config.TcpKeepAliveInterval != 0 {
+			if err := syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, int(config.TcpKeepAliveInterval)); err != nil {
+				return newError("failed to set TCP_KEEPINTVL", err)
+			}
+		}
 	}
 
 	if config.Tproxy.IsEnabled() {
@@ -81,6 +87,12 @@ func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig)
 				return newError("failed to set TCP_FASTOPEN=", tfo).Base(err)
 			}
 		}
+
+		if config.TcpKeepAliveInterval != 0 {
+			if err := syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, int(config.TcpKeepAliveInterval)); err != nil {
+				return newError("failed to set TCP_KEEPINTVL", err)
+			}
+		}
 	}
 
 	if config.Tproxy.IsEnabled() {