Config switch to turn on/off Quic processing (#9679)

Extending quic listener configuration with runtime feature flag for enabling/disabling quic processing.

Signed-off-by: Kateryna Nezdolii <nezdolik@spotify.com>

Mirrored from https://github.com/envoyproxy/envoy @ 853ecaa2f1e7364c1db49dad6a91bfcb3bcc4d61

envoy/config/listener/v3/quic_config.proto

@@ -2,6 +2,8 @@ syntax = "proto3";
 
 package envoy.config.listener.v3;
 
+import "envoy/config/core/v3/base.proto";
+
 import "google/protobuf/duration.proto";
 import "google/protobuf/wrappers.proto";
 
@@ -16,7 +18,7 @@ option (udpa.annotations.file_status).package_version_status = ACTIVE;
 // [#protodoc-title: QUIC listener Config]
 
 // Configuration specific to the QUIC protocol.
-// Next id: 4
+// Next id: 5
 message QuicProtocolOptions {
   option (udpa.annotations.versioning).previous_message_type =
       "envoy.api.v2.listener.QuicProtocolOptions";
@@ -32,4 +34,8 @@ message QuicProtocolOptions {
   // Connection timeout in milliseconds before the crypto handshake is finished.
   // 20000ms if not specified.
   google.protobuf.Duration crypto_handshake_timeout = 3;
+
+  // Runtime flag that controls whether the listener is enabled or not. If not specified, defaults
+  // to enabled.
+  core.v3.RuntimeFeatureFlag enabled = 4;
 }

envoy/config/listener/v4alpha/quic_config.proto

@@ -2,6 +2,8 @@ syntax = "proto3";
 
 package envoy.config.listener.v4alpha;
 
+import "envoy/config/core/v4alpha/base.proto";
+
 import "google/protobuf/duration.proto";
 import "google/protobuf/wrappers.proto";
 
@@ -16,7 +18,7 @@ option (udpa.annotations.file_status).package_version_status = NEXT_MAJOR_VERSIO
 // [#protodoc-title: QUIC listener Config]
 
 // Configuration specific to the QUIC protocol.
-// Next id: 4
+// Next id: 5
 message QuicProtocolOptions {
   option (udpa.annotations.versioning).previous_message_type =
       "envoy.config.listener.v3.QuicProtocolOptions";
@@ -32,4 +34,8 @@ message QuicProtocolOptions {
   // Connection timeout in milliseconds before the crypto handshake is finished.
   // 20000ms if not specified.
   google.protobuf.Duration crypto_handshake_timeout = 3;
+
+  // Runtime flag that controls whether the listener is enabled or not. If not specified, defaults
+  // to enabled.
+  core.v4alpha.RuntimeFeatureFlag enabled = 4;
 }