// Copyright 2016 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

syntax = "proto2";
option optimize_for = LITE_RUNTIME;

package patchpanel;

message SubprocessMessage {
  oneof message_type {
    ControlMessage control_message = 1;    // Message from Manager to subprocess
    FeedbackMessage feedback_message = 2;  // Message from subprocess to Manager
  }
}

message ControlMessage {
  oneof message_type {
    GuestMessage guest_message = 1;
    DeviceMessage device_message = 2;
    NDProxyControlMessage ndproxy_control = 3;
  }
}

message FeedbackMessage {
  oneof message_type {
    NDProxySignalMessage ndproxy_signal = 1;
  }
}

// Best practice is to use optional fields, but since the client and server
// are always in sync, these messages use required fields to save on
// validation.

// If |br_ifname| exists in the message, a creation or deletion event
// occurred for the bridge interface.
// Otherwise, the event is occurred for the physical interface |dev_ifname|.
message DeviceMessage {
  required string dev_ifname = 1;
  optional string br_ifname = 2;
  optional bool teardown = 3;  // value is ignored
  optional bool force_local_next_hop = 4;
}

message GuestMessage {
  enum GuestType {
    UNKNOWN_GUEST = 0;
    ARC = 1;         // ARC++ Container (P & higher)
    ARC_VM = 2;      // ARC VM
    TERMINA_VM = 3;  // Crostini Termina VM
    PLUGIN_VM = 4;   // Plugin VM
  }
  required GuestType type = 1;

  enum GuestEvent {
    UNKNOWN_EVENT = 0;
    START = 1;
    STOP = 2;
  }
  required GuestEvent event = 2;

  // The PID of the ARC++ container.
  optional int32 arc_pid = 3;

  // The VSOCK CID of the ARCVM.
  optional uint32 arcvm_vsock_cid = 4;
}

// Message sent from main process (GuestIPv6Service) to NDProxy daemon process.
// For START_NS_NA_RS_RA and START_NS_NA_RS_RA_MODIFYING_ROUTER_ADDRESS,
// |if_id_primary| contains the upstream interface id and |if_id_secondary|
// contains the downstream. For START_NS_NA and STOP_PROXY, |if_id_primary| and
// |if_id_secondary| are exchangeable and contain the ids of the forwarding
// interface pair. For START_NEIGHBOR_MONITOR and STOP_NEIGHBOR_MONITOR,
// |if_id_primary| contains the downstream interface that neighbor IP is
// monitored and |if_id_secondary| is left empty.
message NDProxyControlMessage {
  enum NDProxyRequestType {
    UNKNOWN = 0;
    START_NS_NA = 1;
    START_NS_NA_RS_RA = 2;
    START_NS_NA_RS_RA_MODIFYING_ROUTER_ADDRESS = 3;
    STOP_PROXY = 4;
    START_NEIGHBOR_MONITOR = 5;
    STOP_NEIGHBOR_MONITOR = 6;
  }
  required NDProxyRequestType type = 1;
  required int32 if_id_primary = 2;
  optional int32 if_id_secondary = 3;
}

// Message sent from NDProxy daemon process to main process upon certain packet
// events. NeighborDetectedSignal triggered when a non-link local address was
// detected on a downstream interface. RouterDetectedSignal trigger when an RA
// was received on an upstream interface.
message NDProxySignalMessage {
  oneof event_type {
    NeighborDetectedSignal neighbor_detected_signal = 1;
    RouterDetectedSignal router_detected_signal = 2;
  }
}

// |if_id| contains the index of interface receiving the packet.
// |ip| is a 16 bytes-long network order bytes array containing the detected
// IPv6 address of the neighbor.
message NeighborDetectedSignal {
  required int32 if_id = 1;
  required bytes ip = 2;  // 16 bytes-long IPv6 address, network order
}

// |if_id| contains the index of interface receiving the packet.
// |ip| is a 16 bytes-long network order bytes array containing the announced
// prefix, and |prefix_len| the length.
message RouterDetectedSignal {
  required int32 if_id = 1;
  required bytes ip = 2;  // 16 bytes-long IPv6 address, network order
  required int32 prefix_len = 3;
}