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syntax = "proto3";
package envoy.api.v2;
option java_outer_classname = "LdsProto";
option java_multiple_files = true;
option java_package = "io.envoyproxy.envoy.api.v2";
option java_generic_services = true;
import "envoy/api/v2/core/address.proto";
import "envoy/api/v2/core/base.proto";
import "envoy/api/v2/discovery.proto";
import "envoy/api/v2/listener/listener.proto";
import "google/api/annotations.proto";
import "google/protobuf/duration.proto";
import "google/protobuf/wrappers.proto";
import "validate/validate.proto";
import "gogoproto/gogo.proto";
option (gogoproto.equal_all) = true;
// [#protodoc-title: Listener]
// Listener :ref:`configuration overview <config_listeners>`
// The Envoy instance initiates an RPC at startup to discover a list of
// listeners. Updates are delivered via streaming from the LDS server and
// consist of a complete update of all listeners. Existing connections will be
// allowed to drain from listeners that are no longer present.
service ListenerDiscoveryService {
rpc StreamListeners(stream DiscoveryRequest) returns (stream DiscoveryResponse) {
rpc FetchListeners(DiscoveryRequest) returns (DiscoveryResponse) {
option (google.api.http) = {
post: "/v2/discovery:listeners"
body: "*"
// [#comment:next free field: 16]
message Listener {
// The unique name by which this listener is known. If no name is provided,
// Envoy will allocate an internal UUID for the listener. If the listener is to be dynamically
// updated or removed via :ref:`LDS <config_listeners_lds>` a unique name must be provided.
// By default, the maximum length of a listener's name is limited to 60 characters. This limit can
// be increased by setting the :option:`--max-obj-name-len` command line argument to the desired
// value.
string name = 1;
// The address that the listener should listen on. In general, the address must be unique, though
// that is governed by the bind rules of the OS. E.g., multiple listeners can listen on port 0 on
// Linux as the actual port will be allocated by the OS.
core.Address address = 2 [(validate.rules).message.required = true, (gogoproto.nullable) = false];
// A list of filter chains to consider for this listener. The
// :ref:`FilterChain <envoy_api_msg_listener.FilterChain>` with the most specific
// :ref:`FilterChainMatch <envoy_api_msg_listener.FilterChainMatch>` criteria is used on a
// connection.
// Example using SNI for filter chain selection can be found in the
// :ref:`FAQ entry <faq_how_to_setup_sni>`.
repeated listener.FilterChain filter_chains = 3
[(validate.rules).repeated .min_items = 1, (gogoproto.nullable) = false];
// If a connection is redirected using *iptables*, the port on which the proxy
// receives it might be different from the original destination address. When this flag is set to
// true, the listener hands off redirected connections to the listener associated with the
// original destination address. If there is no listener associated with the original destination
// address, the connection is handled by the listener that receives it. Defaults to false.
// .. attention::
// This field is deprecated. Use :ref:`an original_dst <config_listener_filters_original_dst>`
// :ref:`listener filter <envoy_api_field_Listener.listener_filters>` instead.
// Note that hand off to another listener is *NOT* performed without this flag. Once
// :ref:`FilterChainMatch <envoy_api_msg_listener.FilterChainMatch>` is implemented this flag
// will be removed, as filter chain matching can be used to select a filter chain based on the
// restored destination address.
google.protobuf.BoolValue use_original_dst = 4 [deprecated = true];
// Soft limit on size of the listener’s new connection read and write buffers.
// If unspecified, an implementation defined default is applied (1MiB).
google.protobuf.UInt32Value per_connection_buffer_limit_bytes = 5;
// Listener metadata.
core.Metadata metadata = 6;
// [#not-implemented-hide:]
message DeprecatedV1 {
// Whether the listener should bind to the port. A listener that doesn't
// bind can only receive connections redirected from other listeners that
// set use_original_dst parameter to true. Default is true.
// [V2-API-DIFF] This is deprecated in v2, all Listeners will bind to their
// port. An additional filter chain must be created for every original
// destination port this listener may redirect to in v2, with the original
// port specified in the FilterChainMatch destination_port field.
// [#comment:TODO(PiotrSikora): Remove this once verified that we no longer need it.]
google.protobuf.BoolValue bind_to_port = 1;
// [#not-implemented-hide:]
DeprecatedV1 deprecated_v1 = 7;
enum DrainType {
// Drain in response to calling /healthcheck/fail admin endpoint (along with the health check
// filter), listener removal/modification, and hot restart.
// Drain in response to listener removal/modification and hot restart. This setting does not
// include /healthcheck/fail. This setting may be desirable if Envoy is hosting both ingress
// and egress listeners.
// The type of draining to perform at a listener-wide level.
DrainType drain_type = 8;
// Listener filters have the opportunity to manipulate and augment the connection metadata that
// is used in connection filter chain matching, for example. These filters are run before any in
// :ref:`filter_chains <envoy_api_field_Listener.filter_chains>`. Order matters as the
// filters are processed sequentially right after a socket has been accepted by the listener, and
// before a connection is created.
repeated listener.ListenerFilter listener_filters = 9 [(gogoproto.nullable) = false];
// The timeout to wait for all listener filters to complete operation. If the timeout is reached,
// the accepted socket is closed without a connection being created. Specify 0 to disable the
// timeout. If not specified, a default timeout of 15s is used.
google.protobuf.Duration listener_filters_timeout = 15 [(gogoproto.stdduration) = true];
// Whether the listener should be set as a transparent socket.
// When this flag is set to true, connections can be redirected to the listener using an
// *iptables* *TPROXY* target, in which case the original source and destination addresses and
// ports are preserved on accepted connections. This flag should be used in combination with
// :ref:`an original_dst <config_listener_filters_original_dst>` :ref:`listener filter
// <envoy_api_field_Listener.listener_filters>` to mark the connections' local addresses as
// "restored." This can be used to hand off each redirected connection to another listener
// associated with the connection's destination address. Direct connections to the socket without
// using *TPROXY* cannot be distinguished from connections redirected using *TPROXY* and are
// therefore treated as if they were redirected.
// When this flag is set to false, the listener's socket is explicitly reset as non-transparent.
// Setting this flag requires Envoy to run with the *CAP_NET_ADMIN* capability.
// When this flag is not set (default), the socket is not modified, i.e. the transparent option
// is neither set nor reset.
google.protobuf.BoolValue transparent = 10;
// Whether the listener should set the *IP_FREEBIND* socket option. When this
// flag is set to true, listeners can be bound to an IP address that is not
// configured on the system running Envoy. When this flag is set to false, the
// option *IP_FREEBIND* is disabled on the socket. When this flag is not set
// (default), the socket is not modified, i.e. the option is neither enabled
// nor disabled.
google.protobuf.BoolValue freebind = 11;
// Additional socket options that may not be present in Envoy source code or
// precompiled binaries.
repeated core.SocketOption socket_options = 13;
// Whether the listener should accept TCP Fast Open (TFO) connections.
// When this flag is set to a value greater than 0, the option TCP_FASTOPEN is enabled on
// the socket, with a queue length of the specified size
// (see `details in RFC7413 <>`_).
// When this flag is set to 0, the option TCP_FASTOPEN is disabled on the socket.
// When this flag is not set (default), the socket is not modified,
// i.e. the option is neither enabled nor disabled.
// On Linux, the net.ipv4.tcp_fastopen kernel parameter must include flag 0x2 to enable
// See `ip-sysctl.txt <>`_.
// On macOS, only values of 0, 1, and unset are valid; other values may result in an error.
// To set the queue length on macOS, set the net.inet.tcp.fastopen_backlog kernel parameter.
google.protobuf.UInt32Value tcp_fast_open_queue_length = 12;
reserved 14;
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