[client,management] add netflow support to client and update management (#3414)

adds NetFlow functionality to track and log network traffic information between peers, with features including:

- Flow logging for TCP, UDP, and ICMP traffic
- Integration with connection tracking system
- Resource ID tracking in NetFlow events
- DNS and exit node collection configuration
- Flow API and Redis cache in management
- Memory-based flow storage implementation
- Kernel conntrack counters and userspace counters
- TCP state machine improvements for more accurate tracking
- Migration from net.IP to netip.Addr in the userspace firewall

flow/proto/flow_grpc.pb.go

@@ -0,0 +1,135 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+
+package proto
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.32.0 or later.
+const _ = grpc.SupportPackageIsVersion7
+
+// FlowServiceClient is the client API for FlowService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type FlowServiceClient interface {
+	// Client to receiver streams of events and acknowledgements
+	Events(ctx context.Context, opts ...grpc.CallOption) (FlowService_EventsClient, error)
+}
+
+type flowServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewFlowServiceClient(cc grpc.ClientConnInterface) FlowServiceClient {
+	return &flowServiceClient{cc}
+}
+
+func (c *flowServiceClient) Events(ctx context.Context, opts ...grpc.CallOption) (FlowService_EventsClient, error) {
+	stream, err := c.cc.NewStream(ctx, &FlowService_ServiceDesc.Streams[0], "/flow.FlowService/Events", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &flowServiceEventsClient{stream}
+	return x, nil
+}
+
+type FlowService_EventsClient interface {
+	Send(*FlowEvent) error
+	Recv() (*FlowEventAck, error)
+	grpc.ClientStream
+}
+
+type flowServiceEventsClient struct {
+	grpc.ClientStream
+}
+
+func (x *flowServiceEventsClient) Send(m *FlowEvent) error {
+	return x.ClientStream.SendMsg(m)
+}
+
+func (x *flowServiceEventsClient) Recv() (*FlowEventAck, error) {
+	m := new(FlowEventAck)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// FlowServiceServer is the server API for FlowService service.
+// All implementations must embed UnimplementedFlowServiceServer
+// for forward compatibility
+type FlowServiceServer interface {
+	// Client to receiver streams of events and acknowledgements
+	Events(FlowService_EventsServer) error
+	mustEmbedUnimplementedFlowServiceServer()
+}
+
+// UnimplementedFlowServiceServer must be embedded to have forward compatible implementations.
+type UnimplementedFlowServiceServer struct {
+}
+
+func (UnimplementedFlowServiceServer) Events(FlowService_EventsServer) error {
+	return status.Errorf(codes.Unimplemented, "method Events not implemented")
+}
+func (UnimplementedFlowServiceServer) mustEmbedUnimplementedFlowServiceServer() {}
+
+// UnsafeFlowServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to FlowServiceServer will
+// result in compilation errors.
+type UnsafeFlowServiceServer interface {
+	mustEmbedUnimplementedFlowServiceServer()
+}
+
+func RegisterFlowServiceServer(s grpc.ServiceRegistrar, srv FlowServiceServer) {
+	s.RegisterService(&FlowService_ServiceDesc, srv)
+}
+
+func _FlowService_Events_Handler(srv interface{}, stream grpc.ServerStream) error {
+	return srv.(FlowServiceServer).Events(&flowServiceEventsServer{stream})
+}
+
+type FlowService_EventsServer interface {
+	Send(*FlowEventAck) error
+	Recv() (*FlowEvent, error)
+	grpc.ServerStream
+}
+
+type flowServiceEventsServer struct {
+	grpc.ServerStream
+}
+
+func (x *flowServiceEventsServer) Send(m *FlowEventAck) error {
+	return x.ServerStream.SendMsg(m)
+}
+
+func (x *flowServiceEventsServer) Recv() (*FlowEvent, error) {
+	m := new(FlowEvent)
+	if err := x.ServerStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// FlowService_ServiceDesc is the grpc.ServiceDesc for FlowService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var FlowService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "flow.FlowService",
+	HandlerType: (*FlowServiceServer)(nil),
+	Methods:     []grpc.MethodDesc{},
+	Streams: []grpc.StreamDesc{
+		{
+			StreamName:    "Events",
+			Handler:       _FlowService_Events_Handler,
+			ServerStreams: true,
+			ClientStreams: true,
+		},
+	},
+	Metadata: "flow.proto",
+}