Fix: add keep alive request duration to configs

transport/internet/config.pb.go

@@ -420,6 +420,7 @@ type SocketConfig struct {
 	BindAddress                []byte `protobuf:"bytes,5,opt,name=bind_address,json=bindAddress,proto3" json:"bind_address,omitempty"`
 	BindPort                   uint32 `protobuf:"varint,6,opt,name=bind_port,json=bindPort,proto3" json:"bind_port,omitempty"`
 	AcceptProxyProtocol        bool   `protobuf:"varint,7,opt,name=accept_proxy_protocol,json=acceptProxyProtocol,proto3" json:"accept_proxy_protocol,omitempty"`
+	KeepAliveDuration          uint32 `protobuf:"varint,8,opt,name=keep_alive_duration,json=keepAliveDuration,proto3" json:"keep_alive_duration,omitempty"`
 }
 
 func (x *SocketConfig) Reset() {
@@ -503,6 +504,13 @@ func (x *SocketConfig) GetAcceptProxyProtocol() bool {
 	return false
 }
 
+func (x *SocketConfig) GetKeepAliveDuration() uint32 {
+	if x != nil {
+		return x.KeepAliveDuration
+	}
+	return 0
+}
+
 var File_transport_internet_config_proto protoreflect.FileDescriptor
 
 var file_transport_internet_config_proto_rawDesc = []byte{
@@ -557,7 +565,7 @@ var file_transport_internet_config_proto_rawDesc = []byte{
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@@ -581,7 +589,10 @@ var file_transport_internet_config_proto_rawDesc = []byte{
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transport/internet/config.proto

@@ -91,4 +91,6 @@ message SocketConfig {
   uint32 bind_port = 6;
 
   bool accept_proxy_protocol = 7;
+
+  uint32 keep_alive_duration = 8;
 }

transport/internet/sockopt_linux.go

@@ -47,6 +47,12 @@ func applyOutboundSocketOptions(network string, address string, fd uintptr, conf
 		}
 	}
 
+	if config.KeepAliveDuration != 0 {
+		if err := syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, int(config.KeepAliveDuration)); err != nil {
+			return newError("failed to set TCP_KEEPINTVL", err)
+		}
+	}
+
 	if isTCPSocket(network) {
 		switch config.Tfo {
 		case SocketConfig_Enable: