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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build darwin dragonfly freebsd netbsd openbsd
package nettest
import (
"runtime"
"strconv"
"strings"
"syscall"
)
func supportsIPv6MulticastDeliveryOnLoopback() bool {
switch runtime.GOOS {
case "freebsd":
// See http://www.freebsd.org/cgi/query-pr.cgi?pr=180065.
// Even after the fix, it looks like the latest
// kernels don't deliver link-local scoped multicast
// packets correctly.
return false
case "darwin":
// See http://support.apple.com/kb/HT1633.
s, err := syscall.Sysctl("kern.osrelease")
if err != nil {
return false
}
ss := strings.Split(s, ".")
if len(ss) == 0 {
return false
}
// OS X 10.9 (Darwin 13) or above seems to do the
// right thing; preserving the packet header as it's
// needed for the checksum calcuration with pseudo
// header on loopback multicast delivery process.
// If not, you'll probably see what is the slow-acting
// kernel crash caused by lazy mbuf corruption.
// See ip6_mloopback in netinet6/ip6_output.c.
if mjver, err := strconv.Atoi(ss[0]); err != nil || mjver < 13 {
return false
}
return true
default:
return true
}
}
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