// LINT: LEGACY_NAMES
syntax = "proto2";

package clearcut.connectivity;

option java_package = "com.android.server.connectivity.metrics";
option java_outer_classname = "IpConnectivityLogClass";

// NetworkId represents the id given by the system to a physical network on the
// Android device. It is used to relates events to each other for devices with
// multiple networks (WiFi, 4G, ...).
message NetworkId {
  // Every network gets assigned a network_id on creation based on order of
  // creation. Thus network_id N is assigned to the network created directly
  // after network N-1. Thus there is no PII involved here. Zero means no
  // network. The value 0 is never assigned to a network.
  optional int32 network_id = 1;
};

// Transport describes a physical technology used by a network. It is a subset
// of the TRANSPORT_* constants defined in android.net.NetworkCapabilities.
enum Transport {
  UNKNOWN   = 0;
  BLUETOOTH = 1;
  CELLULAR  = 2;
  ETHERNET  = 3;
  WIFI      = 4;
};

// A pair of (key, value) integers for describing histogram-like statistics.
message Pair {
  optional int32 key = 1;
  optional int32 value = 2;
};

// Logs changes in the system default network. Changes can be 1) acquiring a
// default network with no previous default, 2) a switch of the system default
// network to a new default network, 3) a loss of the system default network.
// This message is associated to android.net.metrics.DefaultNetworkEvent.
message DefaultNetworkEvent {
  // A value of 0 means this is a loss of the system default network.
  optional NetworkId network_id = 1;

  // A value of 0 means there was no previous default network.
  optional NetworkId previous_network_id = 2;

  // Whether the network supports IPv4, IPv6, or both.
  enum IPSupport {
    NONE = 0;
    IPV4 = 1;
    IPV6 = 2;
    DUAL = 3;
  };

  // Best available information about IP support of the previous network when
  // disconnecting or switching to a new default network.
  optional IPSupport previous_network_ip_support = 3;

  // The transport types of the new default network, represented by
  // TRANSPORT_* constants as defined in NetworkCapabilities.
  repeated int32 transport_types = 4;
};

// Logs IpReachabilityMonitor probe events and NUD_FAILED events.
// This message is associated to android.net.metrics.IpReachabilityEvent.
message IpReachabilityEvent {
  // The interface name (wlan, rmnet, lo, ...) on which the probe was sent.
  // Deprecated since version 2, replaced by transport field.
  optional string if_name = 1 [deprecated = true];

  // The event type code of the probe, represented by constants defined in
  // android.net.metrics.IpReachabilityEvent.
  // NUD_FAILED_ORGANIC and PROVISIONING_LOST_ORGANIC recorded since version 1.
  optional int32 event_type = 2;
};

// Logs NetworkMonitor and ConnectivityService events related to the state of
// a network: connection, evaluation, validation, lingering, and disconnection.
// This message is associated to android.net.metrics.NetworkEvent.
message NetworkEvent {
  // The id of the network on which this event happened.
  optional NetworkId network_id = 1;

  // The type of network event, represented by NETWORK_* constants defined in
  // android.net.metrics.NetworkEvent.
  optional int32 event_type = 2;

  // Only valid after finishing evaluating a network for Internet connectivity.
  // The time it took for this evaluation to complete.
  optional int32 latency_ms = 3;
}

// Logs individual captive portal probing events that are performed when
// evaluating or reevaluating networks for Internet connectivity.
// This message is associated to android.net.metrics.ValidationProbeEvent.
message ValidationProbeEvent {
  // The id of the network for which the probe was sent.
  optional NetworkId network_id = 1;

  // The time it took for that probe to complete or time out.
  optional int32 latency_ms = 2;

  // The type of portal probe, represented by PROBE_* constants defined in
  // android.net.metrics.ValidationProbeEvent.
  optional int32 probe_type = 3;

  // The http code result of the probe test.
  optional int32 probe_result = 4;
}

// Logs DNS lookup latencies. Repeated fields must have the same length.
// This message is associated to android.net.metrics.DnsEvent.
// Deprecated since version 2.
message DNSLookupBatch {
  // The id of the network on which the DNS lookups took place.
  optional NetworkId network_id = 1;

  // The types of the DNS lookups, as defined in android.net.metrics.DnsEvent.
  repeated int32 event_types = 2;

  // The return values of the DNS resolver for each DNS lookups.
  repeated int32 return_codes = 3;

  // The time it took for each DNS lookups to complete.
  repeated int32 latencies_ms = 4;
};

// Represents a collections of DNS lookup latencies and counters for a
// particular combination of DNS query type and return code.
// Since version 2.
message DNSLatencies {
  // The type of the DNS lookups, as defined in android.net.metrics.DnsEvent.
  // Acts as a key for a set of DNS query results.
  // Possible values are: 0 for getaddrinfo, 1 for gethostbyname.
  optional int32 type = 1;

  // The return value of the DNS resolver for the DNS lookups.
  // Acts as a key for a set of DNS query results.
  // Possible values are: 0 for success, or errno code for failures.
  optional int32 return_code = 2;

  // The number of query operations recorded.
  optional int32 query_count = 3;

  // The number of query operations returning A IPv4 records.
  optional int32 a_count = 4;

  // The number of query operations returning AAAA IPv6 records.
  optional int32 aaaa_count = 5;

  // The time it took for each DNS lookup to complete. The number of repeated
  // values can be less than query_count in case of event rate-limiting.
  repeated int32 latencies_ms = 6;
};

// Represents latency and errno statistics of the connect() system call.
// Since version 2.
message ConnectStatistics {
  // The number of connect() operations recorded.
  optional int32 connect_count = 1;

  // The number of connect() operations with IPv6 socket address.
  optional int32 ipv6_addr_count = 2;

  // The time it took for each successful connect() operation to complete.
  // The number of repeated values can be less than connect_count in case of
  // event rate-limiting.
  repeated int32 latencies_ms = 3;

  // Counts of all error values returned by failed connect() operations.
  // The Pair key field is the errno code. The Pair value field is the count
  // for that errno code.
  repeated Pair errnos_counters = 4;
};

// Represents a DHCP event on a single interface, which can be a DHCPClient
// state transition or a response packet parsing error.
// This message is associated to android.net.metrics.DhcpClientEvent and
// android.net.metrics.DhcpErrorEvent.
message DHCPEvent {
  // The interface name (wlan, rmnet, lo, ...) on which the event happened.
  // Deprecated since version 2, replaced by transport field.
  optional string if_name = 1 [deprecated = true];

  oneof value {
    // The name of a state in the DhcpClient state machine, represented by
    // the inner classes of android.net.dhcp.DhcpClient.
    string state_transition = 2;

    // The error code of a DHCP error, represented by constants defined in
    // android.net.metrics.DhcpErrorEvent.
    int32 error_code = 3;
  }

  // Lifetime duration in milliseconds of a DhcpClient state, or transition
  // time in milliseconds between specific pairs of DhcpClient's states.
  // Only populated since version 1, when state_transition is populated.
  optional int32 duration_ms = 4;
}

// Represents the generation of an Android Packet Filter program.
// Since version 1.
message ApfProgramEvent {
  // Lifetime of the program in seconds.
  optional int64 lifetime = 1;

  // Number of RAs filtered by the APF program.
  optional int32 filtered_ras = 2;

  // Total number of RAs to filter currently tracked by ApfFilter. Can be more
  // than filtered_ras if all available program size was exhausted.
  optional int32 current_ras = 3;

  // Length of the APF program in bytes.
  optional int32 program_length = 4;

  // True if the APF program is dropping multicast and broadcast traffic.
  optional bool drop_multicast = 5;

  // True if the interface on which APF runs has an IPv4 address.
  optional bool has_ipv4_addr = 6;
}

// Represents Router Advertisement listening statistics for an interface with
// Android Packet Filter enabled.
// Since version 1.
message ApfStatistics {
  // The time interval in milliseconds these stastistics cover.
  optional int64 duration_ms = 1;

  // The total number of received RAs.
  optional int32 received_ras = 2;

  // The total number of received RAs that matched a known RA.
  optional int32 matching_ras = 3;

  // The total number of received RAs ignored due to the MAX_RAS limit.
  optional int32 dropped_ras = 5;

  // The total number of received RAs with an effective lifetime of 0 seconds.
  // Effective lifetime for APF is the minimum of all lifetimes in a RA.
  optional int32 zero_lifetime_ras = 6;

  // The total number of received RAs that could not be parsed.
  optional int32 parse_errors = 7;

  // The total number of APF program updates triggered by an RA reception.
  optional int32 program_updates = 8;

  // The maximum APF program size in byte advertised by hardware.
  optional int32 max_program_size = 9;
}

// Represents the reception of a Router Advertisement packet for an interface
// with Android Packet Filter enabled.
// Since version 1.
message RaEvent {
  // All lifetime values are expressed in seconds. The default value for an
  // option lifetime that was not present in the RA option list is -1.
  // The lifetime of an option (e.g., the Prefix Information Option) is the
  // minimum lifetime of all such options in the packet.

  // The value of the router lifetime in the RA packet.
  optional int64 router_lifetime = 1;

  // Prefix valid lifetime from the prefix information option.
  optional int64 prefix_valid_lifetime = 2;

  // Prefix preferred lifetime from the prefix information option.
  optional int64 prefix_preferred_lifetime = 3;

  // Route info lifetime.
  optional int64 route_info_lifetime = 4;

  // Recursive DNS server lifetime.
  optional int64 rdnss_lifetime = 5;

  // DNS search list lifetime.
  optional int64 dnssl_lifetime = 6;
}

// Represents an IP provisioning event in IpManager and how long the
// provisioning action took.
// This message is associated to android.net.metrics.IpManagerEvent.
message IpProvisioningEvent {
  // The interface name (wlan, rmnet, lo, ...) on which the probe was sent.
  // Deprecated since version 2, replaced by transport field.
  optional string if_name = 1 [deprecated = true];

  // The code of the IP provisioning event, represented by constants defined in
  // android.net.metrics.IpManagerEvent.
  optional int32 event_type = 2;

  // The duration of the provisioning action that resulted in this event.
  optional int32 latency_ms = 3;
}

// Represents one of the IP connectivity event defined in this file.
// Next tag: 15
message IpConnectivityEvent {
  // Time in ms when the event was recorded.
  optional int64 time_ms = 1;

  // Physical transport of the network on which the event happened.
  // Since version 2.
  optional Transport transport = 12;

  // Event type.
  oneof event {

    // An event about the system default network.
    DefaultNetworkEvent default_network_event = 2;

    // An IP reachability probe event.
    IpReachabilityEvent ip_reachability_event = 3;

    // A network lifecycle event.
    NetworkEvent network_event = 4;

    // A batch of DNS lookups.
    // Deprecated in the nyc-mr2 release since version 2, and replaced by dns_latencies.
    DNSLookupBatch dns_lookup_batch = 5 [deprecated = true];

    // DNS lookup latency statistics.
    DNSLatencies dns_latencies = 13;

    // Connect latency and errno statistics.
    ConnectStatistics connect_statistics = 14;

    // A DHCP client event or DHCP receive error.
    DHCPEvent dhcp_event = 6;

    // An IP provisioning event.
    IpProvisioningEvent ip_provisioning_event = 7;

    // A network validation probe event.
    ValidationProbeEvent validation_probe_event = 8;

    // An Android Packet Filter program event.
    ApfProgramEvent apf_program_event = 9;

    // An Android Packet Filter statistics event.
    ApfStatistics apf_statistics = 10;

    // An RA packet reception event.
    RaEvent ra_event = 11;
  };
};

// The information about IP connectivity events.
message IpConnectivityLog {
  // An array of IP connectivity events.
  repeated IpConnectivityEvent events = 1;

  // The number of events that had to be dropped due to a full buffer.
  optional int32 dropped_events = 2;

  // The version number of the metrics events being collected.
  //  nyc-dev: not populated, implicitly 0.
  //  nyc-dr1: not populated, implicitly 1 (sailfish and marlin only).
  //  nyc-mr1: not populated, implicitly 1.
  //  nyc-mr2: 2.
  optional int32 version = 3;
};