mirror of
https://github.com/refraction-networking/uquic.git
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95575f5fe7
uTLS is not yet bumped to the new version, so this commit breaks the dependencies relationship by getting rid of the local replace.
74 lines
2.2 KiB
Go
74 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/refraction-networking/uquic/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/refraction-networking/uquic/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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