github.com/quic-go/quic-go@v0.44.0/sys_conn_df_windows.go (about) 1 //go:build windows 2 3 package quic 4 5 import ( 6 "errors" 7 "syscall" 8 9 "golang.org/x/sys/windows" 10 11 "github.com/quic-go/quic-go/internal/utils" 12 ) 13 14 const ( 15 // IP_DONTFRAGMENT controls the Don't Fragment (DF) bit. 16 // 17 // It's the same code point for both IPv4 and IPv6 on Windows. 18 // https://microsoft.github.io/windows-docs-rs/doc/windows/Win32/Networking/WinSock/constant.IP_DONTFRAG.html 19 // https://microsoft.github.io/windows-docs-rs/doc/windows/Win32/Networking/WinSock/constant.IPV6_DONTFRAG.html 20 // 21 //nolint:stylecheck 22 IP_DONTFRAGMENT = 14 23 ) 24 25 func setDF(rawConn syscall.RawConn) (bool, error) { 26 var errDFIPv4, errDFIPv6 error 27 if err := rawConn.Control(func(fd uintptr) { 28 errDFIPv4 = windows.SetsockoptInt(windows.Handle(fd), windows.IPPROTO_IP, IP_DONTFRAGMENT, 1) 29 errDFIPv6 = windows.SetsockoptInt(windows.Handle(fd), windows.IPPROTO_IPV6, IP_DONTFRAGMENT, 1) 30 }); err != nil { 31 return false, err 32 } 33 switch { 34 case errDFIPv4 == nil && errDFIPv6 == nil: 35 utils.DefaultLogger.Debugf("Setting DF for IPv4 and IPv6.") 36 case errDFIPv4 == nil && errDFIPv6 != nil: 37 utils.DefaultLogger.Debugf("Setting DF for IPv4.") 38 case errDFIPv4 != nil && errDFIPv6 == nil: 39 utils.DefaultLogger.Debugf("Setting DF for IPv6.") 40 case errDFIPv4 != nil && errDFIPv6 != nil: 41 return false, errors.New("setting DF failed for both IPv4 and IPv6") 42 } 43 return true, nil 44 } 45 46 func isSendMsgSizeErr(err error) bool { 47 // https://docs.microsoft.com/en-us/windows/win32/winsock/windows-sockets-error-codes-2 48 return errors.Is(err, windows.WSAEMSGSIZE) 49 } 50 51 func isRecvMsgSizeErr(err error) bool { 52 // https://docs.microsoft.com/en-us/windows/win32/winsock/windows-sockets-error-codes-2 53 return errors.Is(err, windows.WSAEMSGSIZE) 54 }