/*
 * Copyright (C) 2022 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

syntax = "proto2";

package perfetto.protos;

enum TrafficDirection {
  DIR_UNSPECIFIED = 0;
  DIR_INGRESS = 1;
  DIR_EGRESS = 2;
}

// NetworkPacketEvent records the details of a single packet sent or received
// on the network (in Linux kernel terminology, one sk_buff struct).
message NetworkPacketEvent {
  // The direction traffic is flowing for this event.
  optional TrafficDirection direction = 1;

  // The name of the interface if available (e.g. 'rmnet0').
  optional string interface = 2;

  // The length of the packet in bytes (wire_size - L2_header_size). Ignored
  // when using NetworkPacketEvent as the ctx in either NetworkPacketBundle or
  // NetworkPacketContext.
  optional uint32 length = 3;

  // The Linux user id associated with the packet's socket.
  optional uint32 uid = 4;

  // The Android network tag associated with the packet's socket.
  optional uint32 tag = 5;

  // The packet's IP protocol (TCP=6, UDP=17, etc).
  optional uint32 ip_proto = 6;

  // The packet's TCP flags as a bitmask (FIN=0x1, SYN=0x2, RST=0x4, etc).
  optional uint32 tcp_flags = 7;

  // The local udp/tcp port of the packet.
  optional uint32 local_port = 8;

  // The remote udp/tcp port of the packet.
  optional uint32 remote_port = 9;
}

// NetworkPacketBundle bundles one or more packets sharing the same attributes.
message NetworkPacketBundle {
  oneof packet_context {
    // The intern id for looking up the associated packet context.
    uint64 iid = 1;

    // The inlined context for events in this bundle.
    NetworkPacketEvent ctx = 2;
  }

  // The timestamp of the i-th packet encoded as the nanoseconds since the
  // enclosing TracePacket's timestamp.
  repeated uint64 packet_timestamps = 3 [packed = true];

  // The length of the i-th packet in bytes (wire_size - L2_header_size).
  repeated uint32 packet_lengths = 4 [packed = true];

  // Total number of packets in the bundle (when above aggregation_threshold).
  optional uint32 total_packets = 5;

  // Duration between first and last packet (when above aggregation_threshold).
  optional uint64 total_duration = 6;

  // Total packet length in bytes (when above aggregation_threshold).
  optional uint64 total_length = 7;
}

// An internable packet context.
message NetworkPacketContext {
  optional uint64 iid = 1;
  optional NetworkPacketEvent ctx = 2;
}