Socket options SO_SNDBUF and SO_RCVBUF support

[modatwork]

Description:

Envoy will handle massive connections when used as L4 proxy. Setting the SO_SNDBUF and SO_RCVBUF socket options helps to limit the memory usage on each connection. So it would be nice to have these options in the APIs.

[optional Relevant Links:]

For downstream, Envoy has a socket_options in the listener config, https://www.envoyproxy.io/docs/envoy/v1.29.0/api-v3/config/listener/v3/listener.proto#config-listener-v3-listener

For upstream, Envoy has a socket_options in the upstream_bind_config field of the cluster config, https://www.envoyproxy.io/docs/envoy/v1.29.0/api-v3/config/cluster/v3/cluster.proto#config-cluster-v3-cluster

[arkodg]

relates to #2600

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.

[aoledk]

How about adding socket options array to ClientTrafficPolicy and BackendTrafficPolicy, for setting socket options in xDS listener and xDS cluster, to limit kernel socket's memory consumption.

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.

[zirain]

@arkodg is this fixed?

[aoledk]

@arkodg is this fixed?

No, this feature's api is still not defined. If we should do, I can work on this.

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.

[aoledk]

/assign