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tcp_keepalive.go
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tcp_keepalive.go
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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package envoy
import (
"syscall"
envoy_api_v2_core "github.com/envoyproxy/go-control-plane/envoy/api/v2/core"
)
// We only support Envoy on Linux so always configure Linux TCP keep-alive
// socket options regardless of the platform that Contour is running on.
const (
TCP_KEEPIDLE = 0x4 // Linux syscall.TCP_KEEPIDLE
TCP_KEEPINTVL = 0x5 // Linux syscall.TCP_KEEPINTVL
TCP_KEEPCNT = 0x6 // Linux syscall.TCP_KEEPCNT
// The following are Linux syscall constants for all
// architectures except MIPS.
SOL_SOCKET = 0x1
SO_KEEPALIVE = 0x9
// IPPROTO_TCP has the same value across Go platforms, but
// is defined here for consistency.
IPPROTO_TCP = syscall.IPPROTO_TCP
)
func TCPKeepaliveSocketOptions() []*envoy_api_v2_core.SocketOption {
// Note: TCP_KEEPIDLE + (TCP_KEEPINTVL * TCP_KEEPCNT) must be greater than
// the grpc.KeepaliveParams time + timeout (currently 60 + 20 = 80 seconds)
// otherwise TestGRPC/StreamClusters fails.
return []*envoy_api_v2_core.SocketOption{
// Enable TCP keep-alive.
{
Description: "Enable TCP keep-alive",
Level: SOL_SOCKET,
Name: SO_KEEPALIVE,
Value: &envoy_api_v2_core.SocketOption_IntValue{IntValue: 1},
State: envoy_api_v2_core.SocketOption_STATE_LISTENING,
},
// The time (in seconds) the connection needs to remain idle
// before TCP starts sending keepalive probes.
{
Description: "TCP keep-alive initial idle time",
Level: IPPROTO_TCP,
Name: TCP_KEEPIDLE,
Value: &envoy_api_v2_core.SocketOption_IntValue{IntValue: 45},
State: envoy_api_v2_core.SocketOption_STATE_LISTENING,
},
// The time (in seconds) between individual keepalive probes.
{
Description: "TCP keep-alive time between probes",
Level: IPPROTO_TCP,
Name: TCP_KEEPINTVL,
Value: &envoy_api_v2_core.SocketOption_IntValue{IntValue: 5},
State: envoy_api_v2_core.SocketOption_STATE_LISTENING,
},
// The maximum number of TCP keep-alive probes to send before
// giving up and killing the connection if no response is
// obtained from the other end.
{
Description: "TCP keep-alive probe count",
Level: IPPROTO_TCP,
Name: TCP_KEEPCNT,
Value: &envoy_api_v2_core.SocketOption_IntValue{IntValue: 9},
State: envoy_api_v2_core.SocketOption_STATE_LISTENING,
},
}
}