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12345678910111213141516171819202122232425262728293031323334// Copyright (c) Tailscale Inc & contributors// SPDX-License-Identifier: BSD-3-Clause
//go:build linux
package main
import ( "fmt" "syscall"
"golang.org/x/sys/unix")
// controlTCPSaveSyn sets TCP_SAVE_SYN on a listening socket when --tcp-save-syn// is enabled. Accepted connections inherit the option.func controlTCPSaveSyn(network string, c syscall.RawConn) error { if !*tcpSaveSyn { return nil } switch network { case "tcp", "tcp4", "tcp6": default: return fmt.Errorf("--tcp-save-syn: unsupported network: %s", network) } var err error if e := c.Control(func(fd uintptr) { err = unix.SetsockoptInt(int(fd), unix.IPPROTO_TCP, unix.TCP_SAVE_SYN, 1) }); e != nil { return e } return err}