| // 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" |
| ) |
| |
| var darwinVersion int |
| |
| func init() { |
| if runtime.GOOS == "darwin" { |
| // See http://support.apple.com/kb/HT1633. |
| s, err := syscall.Sysctl("kern.osrelease") |
| if err != nil { |
| return |
| } |
| ss := strings.Split(s, ".") |
| if len(ss) == 0 { |
| return |
| } |
| darwinVersion, _ = strconv.Atoi(ss[0]) |
| } |
| } |
| |
| 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": |
| return !causesIPv6Crash() |
| default: |
| return true |
| } |
| } |
| |
| func causesIPv6Crash() bool { |
| // We see some kernel crash when running IPv6 with IP-level |
| // options on Darwin kernel version 12 or below. |
| // See golang.org/issues/17015. |
| return darwinVersion < 13 |
| } |
