75 lines
2.2 KiB
Go
75 lines
2.2 KiB
Go
//go:build darwin
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package quic
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import (
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"errors"
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"strconv"
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"strings"
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"syscall"
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"golang.org/x/sys/unix"
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"github.com/quic-go/quic-go/internal/utils"
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)
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func setDF(rawConn syscall.RawConn) (bool, error) {
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// Setting DF bit is only supported from macOS11
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// https://github.com/chromium/chromium/blob/117.0.5881.2/net/socket/udp_socket_posix.cc#L555
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if supportsDF, err := isAtLeastMacOS11(); !supportsDF || err != nil {
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return false, err
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}
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// Enabling IP_DONTFRAG will force the kernel to return "sendto: message too long"
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// and the datagram will not be fragmented
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var errDFIPv4, errDFIPv6 error
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if err := rawConn.Control(func(fd uintptr) {
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errDFIPv4 = unix.SetsockoptInt(int(fd), unix.IPPROTO_IP, unix.IP_DONTFRAG, 1)
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errDFIPv6 = unix.SetsockoptInt(int(fd), unix.IPPROTO_IPV6, unix.IPV6_DONTFRAG, 1)
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}); err != nil {
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return false, err
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}
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switch {
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case errDFIPv4 == nil && errDFIPv6 == nil:
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utils.DefaultLogger.Debugf("Setting DF for IPv4 and IPv6.")
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case errDFIPv4 == nil && errDFIPv6 != nil:
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utils.DefaultLogger.Debugf("Setting DF for IPv4.")
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case errDFIPv4 != nil && errDFIPv6 == nil:
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utils.DefaultLogger.Debugf("Setting DF for IPv6.")
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// On macOS, the syscall for setting DF bit for IPv4 fails on dual-stack listeners.
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// Treat the connection as not having DF enabled, even though the DF bit will be set
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// when used for IPv6.
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// See https://github.com/quic-go/quic-go/issues/3793 for details.
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return false, nil
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case errDFIPv4 != nil && errDFIPv6 != nil:
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return false, errors.New("setting DF failed for both IPv4 and IPv6")
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}
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return true, nil
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}
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func isSendMsgSizeErr(err error) bool {
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return errors.Is(err, unix.EMSGSIZE)
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}
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func isRecvMsgSizeErr(error) bool { return false }
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func isAtLeastMacOS11() (bool, error) {
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uname := &unix.Utsname{}
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err := unix.Uname(uname)
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if err != nil {
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return false, err
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}
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release := string(uname.Release[:])
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if idx := strings.Index(release, "."); idx != -1 {
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version, err := strconv.Atoi(release[:idx])
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if err != nil {
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return false, err
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}
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// Darwin version 20 is macOS version 11
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// https://en.wikipedia.org/wiki/Darwin_(operating_system)#Darwin_20_onwards
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return version >= 20, nil
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}
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return false, nil
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}
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