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only run DPLPMTUD if the connection can send packets with the DF bit set (#3879)

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This commit is contained in:
Marten Seemann
2023-06-02 16:54:34 +03:00
committed by GitHub
parent 0438eada95
commit 614fdb3271
15 changed files with 67 additions and 26 deletions
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8
sys_conn_df_windows.go
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@@ -19,13 +19,13 @@ const (
IPV6_DONTFRAG = 14
)
func setDF(rawConn syscall.RawConn) error {
func setDF(rawConn syscall.RawConn) (bool, error) {
var errDFIPv4, errDFIPv6 error
if err := rawConn.Control(func(fd uintptr) {
errDFIPv4 = windows.SetsockoptInt(windows.Handle(fd), windows.IPPROTO_IP, IP_DONTFRAGMENT, 1)
errDFIPv6 = windows.SetsockoptInt(windows.Handle(fd), windows.IPPROTO_IPV6, IPV6_DONTFRAG, 1)
}); err != nil {
return err
return false, err
}
switch {
case errDFIPv4 == nil && errDFIPv6 == nil:
@@ -35,9 +35,9 @@ func setDF(rawConn syscall.RawConn) error {
case errDFIPv4 != nil && errDFIPv6 == nil:
utils.DefaultLogger.Debugf("Setting DF for IPv6.")
case errDFIPv4 != nil && errDFIPv6 != nil:
return errors.New("setting DF failed for both IPv4 and IPv6")
return false, errors.New("setting DF failed for both IPv4 and IPv6")
}
return nil
return true, nil
}
func isMsgSizeErr(err error) bool {