Document available cipher list for ServerTLSSettings (#2718)

* Document available cipher list for ServerTLSSettings

Signed-off-by: Faseela K <faseela.k@est.tech>

* address review comments

Signed-off-by: Faseela K <faseela.k@est.tech>

---------

Signed-off-by: Faseela K <faseela.k@est.tech>

Author: kfaseela

networking/v1alpha3/gateway.gen.json

@@ -730,6 +730,23 @@ message ServerTLSSettings {
   TLSProtocol max_protocol_version = 8;
 
   // Optional: If specified, only support the specified cipher list.
-  // Otherwise default to the default cipher list supported by Envoy.
+  // Otherwise default to the default cipher list supported by Envoy
+  // as specified [here](https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/transport_sockets/tls/v3/common.proto).
+  // The supported list of ciphers are:
+  // * `ECDHE-ECDSA-AES128-GCM-SHA256`
+  // * `ECDHE-RSA-AES128-GCM-SHA256`
+  // * `ECDHE-ECDSA-AES256-GCM-SHA384`
+  // * `ECDHE-RSA-AES256-GCM-SHA384`
+  // * `ECDHE-ECDSA-CHACHA20-POLY1305`
+  // * `ECDHE-RSA-CHACHA20-POLY1305`
+  // * `ECDHE-ECDSA-AES128-SHA`
+  // * `ECDHE-RSA-AES128-SHA`
+  // * `ECDHE-ECDSA-AES256-SHA`
+  // * `ECDHE-RSA-AES256-SHA`
+  // * `AES128-GCM-SHA256`
+  // * `AES256-GCM-SHA384`
+  // * `AES128-SHA`
+  // * `AES256-SHA`
+  // * `DES-CBC3-SHA`
   repeated string cipher_suites = 9;
 }

networking/v1alpha3/gateway.pb.go

@@ -730,6 +730,23 @@ message ServerTLSSettings {
   TLSProtocol max_protocol_version = 8;
 
   // Optional: If specified, only support the specified cipher list.
-  // Otherwise default to the default cipher list supported by Envoy.
+  // Otherwise default to the default cipher list supported by Envoy
+  // as specified [here](https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/transport_sockets/tls/v3/common.proto).
+  // The supported list of ciphers are:
+  // * `ECDHE-ECDSA-AES128-GCM-SHA256`
+  // * `ECDHE-RSA-AES128-GCM-SHA256`
+  // * `ECDHE-ECDSA-AES256-GCM-SHA384`
+  // * `ECDHE-RSA-AES256-GCM-SHA384`
+  // * `ECDHE-ECDSA-CHACHA20-POLY1305`
+  // * `ECDHE-RSA-CHACHA20-POLY1305`
+  // * `ECDHE-ECDSA-AES128-SHA`
+  // * `ECDHE-RSA-AES128-SHA`
+  // * `ECDHE-ECDSA-AES256-SHA`
+  // * `ECDHE-RSA-AES256-SHA`
+  // * `AES128-GCM-SHA256`
+  // * `AES256-GCM-SHA384`
+  // * `AES128-SHA`
+  // * `AES256-SHA`
+  // * `DES-CBC3-SHA`
   repeated string cipher_suites = 9;
 }