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lds: Add TCP_FASTOPEN listener option #539

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Merged
htuch merged 1 commit into from
Apr 5, 2018
Merged

lds: Add TCP_FASTOPEN listener option #539

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16 changes: 16 additions & 0 deletions envoy/api/v2/lds.proto
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Original file line number Diff line number Diff line change
Expand Up @@ -150,4 +150,20 @@ message Listener {
// (default), the socket is not modified, i.e. the option is neither enabled
// nor disabled.
google.protobuf.BoolValue freebind = 11;

// 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 <https://tools.ietf.org/html/rfc7413#section-5.1>`_).
// 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
// TCP_FASTOPEN.
// See `ip-sysctl.txt <https://www.kernel.org/doc/Documentation/networking/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;
}