45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
//go:build linux || freebsd || openbsd || darwin
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package server
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import (
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"fmt"
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"net"
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"syscall"
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"github.com/traefik/traefik/v3/pkg/config/static"
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"golang.org/x/sys/unix"
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)
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// newListenConfig creates a new net.ListenConfig for the given configuration of
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// the entry point.
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func newListenConfig(configuration *static.EntryPoint) (lc net.ListenConfig) {
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if configuration != nil && configuration.ReusePort {
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lc.Control = controlReusePort
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}
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return
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}
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// controlReusePort is a net.ListenConfig.Control function that enables SO_REUSEPORT
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// on the socket.
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func controlReusePort(network, address string, c syscall.RawConn) error {
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var setSockOptErr error
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err := c.Control(func(fd uintptr) {
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// Note that net.ListenConfig enables unix.SO_REUSEADDR by default,
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// as seen in https://go.dev/src/net/sockopt_linux.go. Therefore, no
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// additional action is required to enable it here.
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setSockOptErr = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unixSOREUSEPORT, 1)
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if setSockOptErr != nil {
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return
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}
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})
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if err != nil {
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return fmt.Errorf("control: %w", err)
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}
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if setSockOptErr != nil {
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return fmt.Errorf("setsockopt: %w", setSockOptErr)
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}
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return nil
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}
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