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// This is heavily derived from
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// https://lyft.github.io/envoy/docs/configuration/listeners/listeners.html
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// The v2 gRPC API differences are tagged with [V2-API-DIFF].
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syntax = "proto3";
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import "api/address.proto";
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import "api/base.proto";
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import "api/tls_context.proto";
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import "google/protobuf/struct.proto";
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import "google/protobuf/wrappers.proto";
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// The Envoy instance initiates an RPC at startup to discover a list of
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// listeners. Updates are delivered via streaming from the LDS server and
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// consist of a complete update of all listeners. Existing connections will be
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// allowed to drain from listeners that are no longer present.
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service ListenerDiscoveryService {
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rpc StreamListeners(ListenerDiscoveryRequest) returns
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(stream ListenerDiscoverResponse) {}
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}
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message ListenerDiscoveryRequest {
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Node node = 1;
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}
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message ListenerDiscoverResponse {
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repeated Listener listeners = 1;
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}
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message Filter {
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// The type of filter to instantiate. Most filters implement a specific type,
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// though it is theoretically possible for a filter to be written such that it
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// can operate in multiple modes. Supported types are read, write, and both.
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enum Type {
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BOTH = 0;
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READ = 1;
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WRITE = 2;
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}
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Type type = 1;
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// The name of the filter to instantiate. The name must match a supported
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// filter.
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google.protobuf.StringValue name = 2;
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// Filter specific configuration which depends on the filter being
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// instantiated. See the supported filters for further documentation.
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google.protobuf.Struct config = 3;
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}
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// Specifies the match criteria for selecting a specific filter chain for a
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// listener [V2-API-DIFF].
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message FilterChainMatch {
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// If non-empty, the SNI domains to consider. May contain a wildcard prefix,
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// e.g. *.example.com.
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repeated google.protobuf.StringValue sni_domains = 1;
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// If non-empty, an IP address and prefix length to match addresses when the
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// listener is bound to 0.0.0.0/::.
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google.protobuf.StringValue address_prefix = 2;
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google.protobuf.UInt32Value prefix_len = 3;
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// If non-empty, an IP address and suffix length to match addresses when the
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// listener is bound to 0.0.0.0/::.
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google.protobuf.StringValue address_suffix = 4;
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google.protobuf.UInt32Value suffix_len = 5;
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}
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// Grouping of FilterChainMatch criteria, DownstreamTlsContext, the actual filter chain
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// and related parameters.
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message FilterChain {
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FilterChainMatch filter_chain_match = 1;
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DownstreamTlsContext tls_context = 2;
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// A list of individual network filters that make up the filter chain for
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// connections established with the listener. Order matters as the filters are
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// processed sequentially as connection events happen. Note: If the filter
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// list is empty, the connection will close by default.
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repeated Filter filter_chain = 3;
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// Whether the listener should expect a PROXY protocol V1 header on new
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// connections. If this option is enabled, the listener will assume that that
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// remote address of the connection is the one specified in the header. Some
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// load balancers including the AWS ELB support this option. If the option is
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// absent or set to false, Envoy will use the physical peer address of the
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// connection as the remote address.
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google.protobuf.BoolValue use_proxy_proto = 4;
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}
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message Listener {
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// The address that the listener should listen on.
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Address address = 1;
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// A list of filter chains to consider for this listener. The FilterChain with
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// the most specific FilterChainMatch criteria is used on a connection. The
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// algorithm works as follows:
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// 1. If SNI information is presented at connection time, only the
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// FilterChains matching the SNI are considered. Otherwise, only
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// FilterChains with no SNI domains are considered.
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// 2. Of the FilterChains from step 1, the longest prefix match on the
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// bound destination address is used to select the next set of
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// FilterChains. This may be one FilterChain or multiple if there is
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// a tie.
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// 3. The longest suffix match on the bound destination address is used to
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// select the FilterChain from step 2 that is used.
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repeated FilterChain filter_chains = 2;
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// Whether the listener should not bind to the port. A listener that doesn’t bind
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// can only receive connections redirected from other listeners that set
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// use_origin_dst parameter to true. Default is true.
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google.protobuf.BoolValue bind_to_port = 3;
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// If a connection is redirected using iptables, the port on which the proxy
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// receives it might be different from the original destination port. When
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// this flag is set to true, the listener hands off redirected connections to
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// the listener associated with the original destination port. If there is no
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// listener associated with the original destination port, the connection is
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// handled by the listener that receives it. Default is false.
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// TODO(htuch): Clarify how use_original_dst interacts with listeners that
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// bind to specific IP addresses, where we want the original destination IP to
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// be used in the FilterChainMatch but not on bind.
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google.protobuf.BoolValue use_original_dst = 4;
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// Soft limit on size of the listener’s new connection read and write buffers.
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// If unspecified, an implementation defined default is applied (1MiB).
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google.protobuf.UInt32Value per_connection_buffer_limit_bytes = 5;
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}
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