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sockopt.go
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sockopt.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Cilium
package cmd
import (
"fmt"
"syscall"
"golang.org/x/sys/unix"
)
// setsockoptReuseAddrAndPort sets the SO_REUSEADDR and SO_REUSEPORT socket options on c's
// underlying socket in order to improve the chance to re-bind to the same address and port
// upon restart.
func setsockoptReuseAddrAndPort(network, address string, c syscall.RawConn) error {
var soerr error
if err := c.Control(func(su uintptr) {
s := int(su)
// Allow reuse of recently-used addresses. This socket option is
// set by default on listeners in Go's net package, see
// net setDefaultListenerSockopts
if err := unix.SetsockoptInt(s, unix.SOL_SOCKET, unix.SO_REUSEADDR, 1); err != nil {
soerr = fmt.Errorf("failed to setsockopt(SO_REUSEADDR): %w", err)
return
}
// Allow reuse of recently-used ports. This gives the agent a
// better chance to re-bind upon restarts.
if err := unix.SetsockoptInt(s, unix.SOL_SOCKET, unix.SO_REUSEPORT, 1); err != nil {
soerr = fmt.Errorf("failed to setsockopt(SO_REUSEPORT): %w", err)
}
}); err != nil {
return err
}
return soerr
}